Don't always send hdr headroom in SurfaceView

Otherwise SurfaceView joins no-op txns with VRI's, which generates false
positives for jank SurfaceView is submitting new transactions that were now late. Instead, just don't submit transactions if we're not changing the headroom.

Bug: 332003860
Test: ShowMultipleBubblesAndSwitchMicrobenchmark#testShowMultipleBubblesAndSwitch
Change-Id: Icf479c3c814493cc89ac44ef8192cd14f156be97