Merge "Camera: Sync camera extensions stubs" into sc-dev am: bd39a02272

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/ex/+/14630593

Change-Id: I90a7919a23ac72de589d6a9789d338ced1379b75
tree: b6abcb37f32b8814a5f4aa25a459d5301e26709e
  1. camera2/
  2. common/
  3. framesequence/
  4. photoviewer/
  5. widget/
  6. CleanSpec.mk
  7. OWNERS