Detect broken IC#endBatchEdit() impl at runtime

This is a safeguard against cases like Bug 203086369, where the UI
thread can be locked up if IC#endBatchEdit() never returns false no
matter how many times it gets called.

With this CL, the system will have a max retry count on how many times
it attempts to call IC#endBatchEdit(), which is currently set to 16,
then fall back to InputMethodManager#restartInput(View) if it hits
such a limit.

This CL also introduces a volatile type cache to early fall back to
the fallback implementation if the same type of InputConnection
implementation class appears again.

As long as InputConnection#{begin,end}BatchEdit() is correctly
implemented, there should be no developer observable behavior change
in this CL.

See the corresponding test CL [1] about when the fallback
implementation is used.

 [1]: Ifb80015ab0f0c32c917a80c4e5f60e836648e7b4

Bug: 203086369
Bug: 208941904
Bug: 209008342
Test: atest CtsInputMethodTestCases:InputMethodStartInputLifecycleTest
Change-Id: I109e0c26d8249fc2e01323e3e1cb36395fa7cc97

0 files changed, 0 insertions, 0 deletions