Import platform/external/firebase-messaging

Review pass in ag/13626625

Bug: 181377527
Test: make
Change-Id: Ie7328d183d2d5ea18c9d156e726b3b1451e5bbf8
16 files changed
tree: 65c5503a4043b45409c9a0c00dd6969564ff14ce
  1. libs/
  2. Android.bp
  3. LICENSE
  4. METADATA
  5. MODULE_LICENSE_APACHE2