Updating PiP API and documentation.
- Renaming PictureInPictureArgs to PictureInPictureParams, making it
immutable and built with a builder class. In addition, making the
aspect ratio rational.
- Moving the check to get max number of actions to the activity to have
more flexibility going forward
- Also ensures that enterPictureInPictureMode() returns true if the
activity is already in PiP mode.
- Will follow up with CL to remove PictureInPictureArgs and related methods
once this CL drops
Bug:
35765211
Bug:
37638323
Bug:
37637423
Bug:
37636674
Bug:
36342780
Test: android.server.cts.ActivityManagerPinnedStackTests
Test: android.app.cts.PictureInPictureParamsBuilderTest
Change-Id: I54a487d55a59c9ce8ac7bd6c80c61209c8b26224
Signed-off-by: Winson Chung <winsonc@google.com>