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Prior to this patch, if BeginFrameSource::AddObserver is slow, it's
possible for SurfaceDependencyDeadline::Set to return true (there is a
deadline) whereas SurfaceDependencyDeadline::has_deadline would return
false because the deadline passed before Set returned. This CL changes
the return value of Set to be has_deadline(). If a deadline hits before
Set returns then Set will now return false.

Bug: 813030, 672962
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I43ca97c57d8da4c915c54a8e97bb2ff5bc07bd87
Reviewed-on: https://chromium-review.googlesource.com/925447Reviewed-by: Saman Sami <samans@chromium.org>
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537784}