Merge Android R (rvc-dev-plus-aosp-without-vendor@6692709)

Bug: 166295507
Merged-In: Iff102d5d44046659da3ebe0b13b7f3390f056bcc
Change-Id: Id7ed53db36cdb9e96c352253ca5c05cc193bb90b
tree: 55518ddec12deb9ea55c19d6286d3c6581b6bcd6
  1. res/
  2. src/
  3. Android.bp
  4. AndroidManifest.xml
  5. CleanSpec.mk
  6. NOTICE
  7. proguard.flags