Import platform/external/firebase-messaging am: 7bcf0907b2

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/firebase-messaging/+/13733197

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I91a921bdc8c60155a7f2f49841c22d8379889b0d
tree: 65c5503a4043b45409c9a0c00dd6969564ff14ce
  1. libs/
  2. Android.bp
  3. LICENSE
  4. METADATA
  5. MODULE_LICENSE_APACHE2