Track jank classification for bufferless layers.

Adds back the tracking of jank classification for layers without buffers, but avoids spamming the log for bufferless layers whose jank data is not drained in time.

Bug: 235178314
Bug: 221393601
Test: atest SurfaceFlinger_test
Change-Id: I870f42e604a4fdbff9afca17308ec9a74cb293e5
1 file changed