commit 5df3b75239886a6a491666636d523e0f4f8490f9
author Riddle Hsu <riddlehsu@google.com> Mon Dec 16 13:27:37 2019 -0600
committer Riddle Hsu <riddlehsu@google.com> Wed Dec 18 16:06:00 2019 +0800
tree d3916887e5727503819c0ebc4e0730b5cb29c5fd
parent 83a8a3bcfddbcad071165b81cfec6e1b89bdcf12

Reduce unnecessary redraw when unlocking

The visible windows may be drawn earlier then the
timing to start requesting draw. And the starting
window should be used to cover the drawing time of
main window.

This may reduce hundreds of milliseconds of unlock
latency on slower devices.

Bug: 139522754
Bug: 140811348
Test: atest ActivityVisibilityTests
            WindowStateTests#testRequestDrawIfNeeded
Test: Use biometrics to unlock device with log
      WM_DEBUG_SCREEN_ON and WM_DEBUG_DRAW enabled.
      There shouldn't have multiple finishDrawingWindow
      from the same window.
Change-Id: I258fad2ef69b7d912ce6f799eb1f3adf29e38aec