Send flush transactions if jank data doesn't arrive in time.

The jank data flush transactions will wake up SurfaceFlinger and have it
process any possibly available jank data and report it back to us. This
is useful if no other transactions are submitted on a surface we care
about and would otherwise time out waiting for jank data.

Bug: 235178314
Bug: 221393601
Bug: 225105422
Test: atest SurfaceFlinger_test
Change-Id: I38f7a084f72f0e73013f854d432baeb54a511ae8