am a1523ce2: Merge "Use ShapeDrawable for floating action button."

* commit 'a1523ce25c7f54b1cfd3543bb5dd0839c6119c66':
  Use ShapeDrawable for floating action button.
tree: cf13667cb1a0f19df31535bb89ade0b74ebe13e8
  1. src/
  2. TestCommon/
  3. tests/