Updating AnimationSpec and related internal APIs to use GraphicBuffer.

THIS IS A MANUAL MERGE OF ag/2311240 (PART 2)

- This reduces the copy of the hardware bitmap when it is
  parceled/unparceled.

Bug: 38507414
Bug: 62021436
Test: Launch Overview to/from app, ensure that the header bar shows
Test: go/wm-smoke
Change-Id: I698e173868e1622322511d82071b1ac89d506687