tree 07a72c8f5cd2666cf529e09c26f2a9a0d080d6d6
parent a0bb096dc6af57fdc944260409d1d75d10103276
author Ady Abraham <adyabr@google.com> 1587593911 -0700
committer Ady Abraham <adyabr@google.com> 1587674651 -0700

SurfaceFlinger: expected present time directly from VSyncReactor

When SurfaceFlinger calculates what is the vsync time, it does
that by asking VSyncReactor what is next anticipated vsync from the
wake up time. To handle negative offsets (when SF wakes up more than
a vsync period before a vsync event) SF adds a vsync period
to that anticipated vsync.

This creates a race condition where the offset used at the
time of invalidate may be different than the offset used by
VSyncReactor calculated at the time of the requestNextVsync().
To fix that, we plumb the first calculated vsync time to
SurfaceFlinger.

Bug: 154303002
Test: Run app transitions and collect systrace
Change-Id: I3f2670c7b0ecb52a85fb07df6d360694b51d5d66