chromeos-dbus-bindings: Add bus parameter to adaptor constructor Take both an object manager and bus pointer For callers who wish not to use an object manager. BUG=chromium:426408 TEST=Unit tests + compile lorgnette Change-Id: I74d0405e0122ac058430c06d001076d3edcc1fde Reviewed-on: https://chromium-review.googlesource.com/225157 Reviewed-by: Alex Deymo <[email protected]> Tested-by: Paul Stewart <[email protected]> Commit-Queue: Paul Stewart <[email protected]>