docs: Restoring file to allow staging reference docs from Gerrit

Previously deleted almost all the docs (with CL http://ag/1970807),
since those docs are now managed and staged/published from Piper.
However, reference docs are still generated in Gerrit, so it's useful
to be able to stage those docs from a Gerrit client--and that was
broken by my change, since the staging tool expects to see
_book.yaml and _project.yaml in the reference doc directory. So,
restoring those files to re-enable staging of reference docs from
Gerrit.

The publish process is *not* changed: we still grab a good build
from the appropriate Gerrit branch and migrate those files into
Piper, then publish the Piper files.

Test: make ds-docs ; devsite stage --site=android en/reference
Change-Id: I392f1699dc68767d1ac9b7113a149062e5e48ef7
diff --git a/docs/html/reference/_book.yaml b/docs/html/reference/_book.yaml
new file mode 100644
index 0000000..b902a61
--- /dev/null
+++ b/docs/html/reference/_book.yaml
@@ -0,0 +1,853 @@
+reference:
+- title: Class Index
+  path: /reference/classes.html
+  status_text: no-toggle
+- title: Package Index
+  path: /reference/packages.html
+  status_text: no-toggle
+- title: android
+  path: /reference/android/package-summary.html
+  status_text: apilevel-1
+- title: android.accessibilityservice
+  path: /reference/android/accessibilityservice/package-summary.html
+  status_text: apilevel-4
+- title: android.accounts
+  path: /reference/android/accounts/package-summary.html
+  status_text: apilevel-5
+- title: android.animation
+  path: /reference/android/animation/package-summary.html
+  status_text: apilevel-11
+- title: android.annotation
+  path: /reference/android/annotation/package-summary.html
+  status_text: apilevel-16
+- title: android.app
+  path: /reference/android/app/package-summary.html
+  status_text: apilevel-1
+- title: android.app.admin
+  path: /reference/android/app/admin/package-summary.html
+  status_text: apilevel-8
+- title: android.app.assist
+  path: /reference/android/app/assist/package-summary.html
+  status_text: apilevel-23
+- title: android.app.backup
+  path: /reference/android/app/backup/package-summary.html
+  status_text: apilevel-8
+- title: android.app.job
+  path: /reference/android/app/job/package-summary.html
+  status_text: apilevel-21
+- title: android.app.usage
+  path: /reference/android/app/usage/package-summary.html
+  status_text: apilevel-21
+- title: android.appwidget
+  path: /reference/android/appwidget/package-summary.html
+  status_text: apilevel-3
+- title: android.bluetooth
+  path: /reference/android/bluetooth/package-summary.html
+  status_text: apilevel-5
+- title: android.bluetooth.le
+  path: /reference/android/bluetooth/le/package-summary.html
+  status_text: apilevel-21
+- title: android.companion
+  path: /reference/android/companion/package-summary.html
+  status_text: apilevel-O
+- title: android.content
+  path: /reference/android/content/package-summary.html
+  status_text: apilevel-1
+- title: android.content.pm
+  path: /reference/android/content/pm/package-summary.html
+  status_text: apilevel-1
+- title: android.content.res
+  path: /reference/android/content/res/package-summary.html
+  status_text: apilevel-1
+- title: android.database
+  path: /reference/android/database/package-summary.html
+  status_text: apilevel-1
+- title: android.database.sqlite
+  path: /reference/android/database/sqlite/package-summary.html
+  status_text: apilevel-1
+- title: android.databinding
+  path: /reference/android/databinding/package-summary.html
+  status_text: apilevel-
+- title: android.drm
+  path: /reference/android/drm/package-summary.html
+  status_text: apilevel-11
+- title: android.gesture
+  path: /reference/android/gesture/package-summary.html
+  status_text: apilevel-4
+- title: android.graphics
+  path: /reference/android/graphics/package-summary.html
+  status_text: apilevel-1
+- title: android.graphics.drawable
+  path: /reference/android/graphics/drawable/package-summary.html
+  status_text: apilevel-1
+- title: android.graphics.drawable.shapes
+  path: /reference/android/graphics/drawable/shapes/package-summary.html
+  status_text: apilevel-1
+- title: android.graphics.fonts
+  path: /reference/android/graphics/fonts/package-summary.html
+  status_text: apilevel-O
+- title: android.graphics.pdf
+  path: /reference/android/graphics/pdf/package-summary.html
+  status_text: apilevel-19
+- title: android.hardware
+  path: /reference/android/hardware/package-summary.html
+  status_text: apilevel-1
+- title: android.hardware.camera2
+  path: /reference/android/hardware/camera2/package-summary.html
+  status_text: apilevel-21
+- title: android.hardware.camera2.params
+  path: /reference/android/hardware/camera2/params/package-summary.html
+  status_text: apilevel-21
+- title: android.hardware.display
+  path: /reference/android/hardware/display/package-summary.html
+  status_text: apilevel-17
+- title: android.hardware.fingerprint
+  path: /reference/android/hardware/fingerprint/package-summary.html
+  status_text: apilevel-23
+- title: android.hardware.input
+  path: /reference/android/hardware/input/package-summary.html
+  status_text: apilevel-16
+- title: android.hardware.usb
+  path: /reference/android/hardware/usb/package-summary.html
+  status_text: apilevel-12
+- title: android.icu.lang
+  path: /reference/android/icu/lang/package-summary.html
+  status_text: apilevel-24
+- title: android.icu.math
+  path: /reference/android/icu/math/package-summary.html
+  status_text: apilevel-24
+- title: android.icu.text
+  path: /reference/android/icu/text/package-summary.html
+  status_text: apilevel-24
+- title: android.icu.util
+  path: /reference/android/icu/util/package-summary.html
+  status_text: apilevel-24
+- title: android.inputmethodservice
+  path: /reference/android/inputmethodservice/package-summary.html
+  status_text: apilevel-3
+- title: android.location
+  path: /reference/android/location/package-summary.html
+  status_text: apilevel-1
+- title: android.media
+  path: /reference/android/media/package-summary.html
+  status_text: apilevel-1
+- title: android.media.audiofx
+  path: /reference/android/media/audiofx/package-summary.html
+  status_text: apilevel-9
+- title: android.media.browse
+  path: /reference/android/media/browse/package-summary.html
+  status_text: apilevel-21
+- title: android.media.effect
+  path: /reference/android/media/effect/package-summary.html
+  status_text: apilevel-14
+- title: android.media.midi
+  path: /reference/android/media/midi/package-summary.html
+  status_text: apilevel-23
+- title: android.media.projection
+  path: /reference/android/media/projection/package-summary.html
+  status_text: apilevel-21
+- title: android.media.session
+  path: /reference/android/media/session/package-summary.html
+  status_text: apilevel-21
+- title: android.media.tv
+  path: /reference/android/media/tv/package-summary.html
+  status_text: apilevel-21
+- title: android.mtp
+  path: /reference/android/mtp/package-summary.html
+  status_text: apilevel-12
+- title: android.net
+  path: /reference/android/net/package-summary.html
+  status_text: apilevel-1
+- title: android.net.http
+  path: /reference/android/net/http/package-summary.html
+  status_text: apilevel-1
+- title: android.net.nsd
+  path: /reference/android/net/nsd/package-summary.html
+  status_text: apilevel-16
+- title: android.net.rtp
+  path: /reference/android/net/rtp/package-summary.html
+  status_text: apilevel-12
+- title: android.net.sip
+  path: /reference/android/net/sip/package-summary.html
+  status_text: apilevel-9
+- title: android.net.wifi
+  path: /reference/android/net/wifi/package-summary.html
+  status_text: apilevel-1
+- title: android.net.wifi.aware
+  path: /reference/android/net/wifi/aware/package-summary.html
+  status_text: apilevel-O
+- title: android.net.wifi.hotspot2
+  path: /reference/android/net/wifi/hotspot2/package-summary.html
+  status_text: apilevel-O
+- title: android.net.wifi.hotspot2.omadm
+  path: /reference/android/net/wifi/hotspot2/omadm/package-summary.html
+  status_text: apilevel-O
+- title: android.net.wifi.hotspot2.pps
+  path: /reference/android/net/wifi/hotspot2/pps/package-summary.html
+  status_text: apilevel-O
+- title: android.net.wifi.p2p
+  path: /reference/android/net/wifi/p2p/package-summary.html
+  status_text: apilevel-14
+- title: android.net.wifi.p2p.nsd
+  path: /reference/android/net/wifi/p2p/nsd/package-summary.html
+  status_text: apilevel-16
+- title: android.nfc
+  path: /reference/android/nfc/package-summary.html
+  status_text: apilevel-9
+- title: android.nfc.cardemulation
+  path: /reference/android/nfc/cardemulation/package-summary.html
+  status_text: apilevel-19
+- title: android.nfc.tech
+  path: /reference/android/nfc/tech/package-summary.html
+  status_text: apilevel-10
+- title: android.opengl
+  path: /reference/android/opengl/package-summary.html
+  status_text: apilevel-1
+- title: android.os
+  path: /reference/android/os/package-summary.html
+  status_text: apilevel-1
+- title: android.os.health
+  path: /reference/android/os/health/package-summary.html
+  status_text: apilevel-24
+- title: android.os.storage
+  path: /reference/android/os/storage/package-summary.html
+  status_text: apilevel-9
+- title: android.preference
+  path: /reference/android/preference/package-summary.html
+  status_text: apilevel-1
+- title: android.print
+  path: /reference/android/print/package-summary.html
+  status_text: apilevel-19
+- title: android.print.pdf
+  path: /reference/android/print/pdf/package-summary.html
+  status_text: apilevel-19
+- title: android.printservice
+  path: /reference/android/printservice/package-summary.html
+  status_text: apilevel-19
+- title: android.provider
+  path: /reference/android/provider/package-summary.html
+  status_text: apilevel-1
+- title: android.renderscript
+  path: /reference/android/renderscript/package-summary.html
+  status_text: apilevel-11
+- title: android.sax
+  path: /reference/android/sax/package-summary.html
+  status_text: apilevel-1
+- title: android.security
+  path: /reference/android/security/package-summary.html
+  status_text: apilevel-14
+- title: android.security.keystore
+  path: /reference/android/security/keystore/package-summary.html
+  status_text: apilevel-23
+- title: android.service.autofill
+  path: /reference/android/service/autofill/package-summary.html
+  status_text: apilevel-O
+- title: android.service.carrier
+  path: /reference/android/service/carrier/package-summary.html
+  status_text: apilevel-22
+- title: android.service.chooser
+  path: /reference/android/service/chooser/package-summary.html
+  status_text: apilevel-23
+- title: android.service.dreams
+  path: /reference/android/service/dreams/package-summary.html
+  status_text: apilevel-17
+- title: android.service.media
+  path: /reference/android/service/media/package-summary.html
+  status_text: apilevel-21
+- title: android.service.notification
+  path: /reference/android/service/notification/package-summary.html
+  status_text: apilevel-18
+- title: android.service.quicksettings
+  path: /reference/android/service/quicksettings/package-summary.html
+  status_text: apilevel-24
+- title: android.service.restrictions
+  path: /reference/android/service/restrictions/package-summary.html
+  status_text: apilevel-21
+- title: android.service.textservice
+  path: /reference/android/service/textservice/package-summary.html
+  status_text: apilevel-14
+- title: android.service.voice
+  path: /reference/android/service/voice/package-summary.html
+  status_text: apilevel-21
+- title: android.service.vr
+  path: /reference/android/service/vr/package-summary.html
+  status_text: apilevel-24
+- title: android.service.wallpaper
+  path: /reference/android/service/wallpaper/package-summary.html
+  status_text: apilevel-7
+- title: android.speech
+  path: /reference/android/speech/package-summary.html
+  status_text: apilevel-3
+- title: android.speech.tts
+  path: /reference/android/speech/tts/package-summary.html
+  status_text: apilevel-4
+- title: android.support.animation
+  path: /reference/android/support/animation/package-summary.html
+  status_text: apilevel-25.3.0
+- title: android.support.annotation
+  path: /reference/android/support/annotation/package-summary.html
+  status_text: apilevel-
+- title: android.support.app.recommendation
+  path: /reference/android/support/app/recommendation/package-summary.html
+  status_text: apilevel-23.0.0
+- title: android.support.compat
+  path: /reference/android/support/compat/package-summary.html
+  status_text: apilevel-
+- title: android.support.coreui
+  path: /reference/android/support/coreui/package-summary.html
+  status_text: apilevel-
+- title: android.support.coreutils
+  path: /reference/android/support/coreutils/package-summary.html
+  status_text: apilevel-
+- title: android.support.customtabs
+  path: /reference/android/support/customtabs/package-summary.html
+  status_text: apilevel-23.0.0
+- title: android.support.design
+  path: /reference/android/support/design/package-summary.html
+  status_text: apilevel-
+- title: android.support.design.widget
+  path: /reference/android/support/design/widget/package-summary.html
+  status_text: apilevel-22.2.0
+- title: android.support.dynamicanimation
+  path: /reference/android/support/dynamicanimation/package-summary.html
+  status_text: apilevel-
+- title: android.support.exifinterface
+  path: /reference/android/support/exifinterface/package-summary.html
+  status_text: apilevel-
+- title: android.support.fragment
+  path: /reference/android/support/fragment/package-summary.html
+  status_text: apilevel-
+- title: android.support.graphics.drawable
+  path: /reference/android/support/graphics/drawable/package-summary.html
+  status_text: apilevel-23.2.0
+- title: android.support.graphics.drawable.animated
+  path: /reference/android/support/graphics/drawable/animated/package-summary.html
+  status_text: apilevel-
+- title: android.support.media
+  path: /reference/android/support/media/package-summary.html
+  status_text: apilevel-25.1.0
+- title: android.support.media.instantvideo
+  path: /reference/android/support/media/instantvideo/package-summary.html
+  status_text: apilevel-
+- title: android.support.media.instantvideo.preload
+  path: /reference/android/support/media/instantvideo/preload/package-summary.html
+  status_text: apilevel-26.0.0-alpha1
+- title: android.support.media.instantvideo.widget
+  path: /reference/android/support/media/instantvideo/widget/package-summary.html
+  status_text: apilevel-26.0.0-alpha1
+- title: android.support.media.tv
+  path: /reference/android/support/media/tv/package-summary.html
+  status_text: apilevel-26.0.0-alpha1
+- title: android.support.mediacompat
+  path: /reference/android/support/mediacompat/package-summary.html
+  status_text: apilevel-
+- title: android.support.multidex
+  path: /reference/android/support/multidex/package-summary.html
+  status_text: apilevel-
+- title: android.support.percent
+  path: /reference/android/support/percent/package-summary.html
+  status_text: apilevel-23.0.0
+- title: android.support.recommendation
+  path: /reference/android/support/recommendation/package-summary.html
+  status_text: apilevel-
+- title: android.support.transition
+  path: /reference/android/support/transition/package-summary.html
+  status_text: apilevel-24.2.0
+- title: android.support.v13
+  path: /reference/android/support/v13/package-summary.html
+  status_text: apilevel-
+- title: android.support.v13.app
+  path: /reference/android/support/v13/app/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v13.view
+  path: /reference/android/support/v13/view/package-summary.html
+  status_text: apilevel-24.0.0
+- title: android.support.v13.view.inputmethod
+  path: /reference/android/support/v13/view/inputmethod/package-summary.html
+  status_text: apilevel-25.0.0
+- title: android.support.v14.preference
+  path: /reference/android/support/v14/preference/package-summary.html
+  status_text: apilevel-23.0.0
+- title: android.support.v17.leanback
+  path: /reference/android/support/v17/leanback/package-summary.html
+  status_text: apilevel-
+- title: android.support.v17.leanback.app
+  path: /reference/android/support/v17/leanback/app/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v17.leanback.database
+  path: /reference/android/support/v17/leanback/database/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v17.leanback.graphics
+  path: /reference/android/support/v17/leanback/graphics/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v17.leanback.media
+  path: /reference/android/support/v17/leanback/media/package-summary.html
+  status_text: apilevel-25.1.0
+- title: android.support.v17.leanback.system
+  path: /reference/android/support/v17/leanback/system/package-summary.html
+  status_text: apilevel-22.2.1
+- title: android.support.v17.leanback.widget
+  path: /reference/android/support/v17/leanback/widget/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v17.leanback.widget.picker
+  path: /reference/android/support/v17/leanback/widget/picker/package-summary.html
+  status_text: apilevel-23.2.0
+- title: android.support.v17.preference
+  path: /reference/android/support/v17/preference/package-summary.html
+  status_text: apilevel-23.0.0
+- title: android.support.v4
+  path: /reference/android/support/v4/package-summary.html
+  status_text: apilevel-
+- title: android.support.v4.accessibilityservice
+  path: /reference/android/support/v4/accessibilityservice/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v4.app
+  path: /reference/android/support/v4/app/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v4.content
+  path: /reference/android/support/v4/content/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v4.content.pm
+  path: /reference/android/support/v4/content/pm/package-summary.html
+  status_text: apilevel-22.2.0
+- title: android.support.v4.content.res
+  path: /reference/android/support/v4/content/res/package-summary.html
+  status_text: apilevel-22.2.0
+- title: android.support.v4.database
+  path: /reference/android/support/v4/database/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v4.graphics
+  path: /reference/android/support/v4/graphics/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v4.graphics.drawable
+  path: /reference/android/support/v4/graphics/drawable/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v4.hardware.display
+  path: /reference/android/support/v4/hardware/display/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v4.hardware.fingerprint
+  path: /reference/android/support/v4/hardware/fingerprint/package-summary.html
+  status_text: apilevel-23.0.0
+- title: android.support.v4.math
+  path: /reference/android/support/v4/math/package-summary.html
+  status_text: apilevel-26.0.0-alpha1
+- title: android.support.v4.media
+  path: /reference/android/support/v4/media/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v4.media.session
+  path: /reference/android/support/v4/media/session/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v4.net
+  path: /reference/android/support/v4/net/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v4.os
+  path: /reference/android/support/v4/os/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v4.print
+  path: /reference/android/support/v4/print/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v4.provider
+  path: /reference/android/support/v4/provider/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v4.text
+  path: /reference/android/support/v4/text/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v4.text.util
+  path: /reference/android/support/v4/text/util/package-summary.html
+  status_text: apilevel-24.2.0
+- title: android.support.v4.util
+  path: /reference/android/support/v4/util/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v4.view
+  path: /reference/android/support/v4/view/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v4.view.accessibility
+  path: /reference/android/support/v4/view/accessibility/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v4.view.animation
+  path: /reference/android/support/v4/view/animation/package-summary.html
+  status_text: apilevel-22.1.0
+- title: android.support.v4.widget
+  path: /reference/android/support/v4/widget/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v7.app
+  path: /reference/android/support/v7/app/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v7.appcompat
+  path: /reference/android/support/v7/appcompat/package-summary.html
+  status_text: apilevel-22.2.0
+- title: android.support.v7.cardview
+  path: /reference/android/support/v7/cardview/package-summary.html
+  status_text: apilevel-
+- title: android.support.v7.content.res
+  path: /reference/android/support/v7/content/res/package-summary.html
+  status_text: apilevel-24.0.0
+- title: android.support.v7.graphics
+  path: /reference/android/support/v7/graphics/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v7.graphics.drawable
+  path: /reference/android/support/v7/graphics/drawable/package-summary.html
+  status_text: apilevel-23.0.0
+- title: android.support.v7.gridlayout
+  path: /reference/android/support/v7/gridlayout/package-summary.html
+  status_text: apilevel-
+- title: android.support.v7.media
+  path: /reference/android/support/v7/media/package-summary.html
+  status_text: apilevel-22.0.0
+- title: android.support.v7.mediarouter
+  path: /reference/android/support/v7/mediarouter/package-summary.html
+  status_text: apilevel-
+- title: android.support.v7.palette
+  path: /reference/android/support/v7/palette/package-summary.html
+  status_text: apilevel-
+- title: android.support.v7.preference
+  path: /reference/android/support/v7/preference/package-summary.html
+  status_text: apilevel-23.0.0
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diff --git a/docs/html/reference/_project.yaml b/docs/html/reference/_project.yaml
new file mode 100644
index 0000000..e5c26e7
--- /dev/null
+++ b/docs/html/reference/_project.yaml
@@ -0,0 +1,6 @@
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+buganizer_id: 30209417
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