Ensure overlapping syncs don't submit buffers out of order

This change will ensure that if multiple SurfaceSyncGroups are created
for the same ViewRootImpl the SurfaceSyncGroups will maintain an order.
The scenario that could occur is the following:

1. SSG1 is created that includes the target VRI. There could be other
   VRIs in SSG1
2. The target VRI draws its frame and marks its own active SSG as ready,
   but SSG1 is still  waiting on other things in the SSG
3. Another SSG2 is created for the target VRI. The second frame renders
   and marks its own second SSG as complete. SSG2 has nothing else to
   wait on, so it will apply at this point, even though SSG1 has not
   finished.
4. Frame2 will get to SF first and Frame1 will later get to SF when
   SSG1 completes.

The code ensures the SSGs that contains the VRI maintain an order. What
happens here is we create a new SSG that's a placeholder. Its only job
is to prevent a SSG from completing. The active SSG for VRI will add a
transaction committed callback and when that's invoked, it will mark the
placeholder SSG as ready. If a new request to create a SSG comes in and
the placeholder SSG is not null, it's added as part of the new active SSG.
A new placeholder SSG is created to correspond to the new active SSG.
This creates a chain to ensure the latter SSG always waits for the former
SSG's transaction to get to SF.

Test: SurfaceSyncGroupTests#testOverlappingSyncsEnsureOrder
Test: WmTests:com.android.server.wm.SurfaceSyncGroupTests
Bug: 272189296
Change-Id: I921d78e347ecfb9786ebe4643308b347c5436332

0 files changed, 0 insertions, 0 deletions