幾乎修正了播放影片當機問題，拖到現在才公布 ...
更新版本後，Facebook 播放影片已經恢復正常了
Merge 59: Fix errors in destruction sequence of GpuVideoEncodeAccelerator::OnWillDestroyStub()
On Windows, we can use GPU IO thread to filter some messages for GPUVEA.
In that case, while GpuVideoEncodeAccelerator::OnWillDestroyStub() is running
on main thread, GpuVideoEncodeAccelerator::OnEncodeFrameCreated() can run
on IO thread. If |encoder_| is reset on main thread and accessed on IO
thread, we see the crashes listed on the bug.
This CL solves the issue by:
- Checking |filter_removed_| which is signaled on IO thread before deciding
to continue with encode GpuVideoEncodeAccelerator::OnEncodeFrameCreated() on
IO thread.
- Making sure that |encoder_worker_thread_| tasks are completed before reset.
BUG=715759
TEST=Tested AppRTC loopback with H264.
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Review-Url: https://codereview.chromium.org/2849443003
Cr-Commit-Position: refs/heads/master@{#468457}
(cherry picked from commit a561de6d59f43481c46e61a34508fa15c5fd2abd)
NOTRY=true
NOPRESUBMIT=true
TBR=sandersd@chromium.org
Review-Url: https://codereview.chromium.org/2856283002
Cr-Commit-Position: refs/branch-heads/3071@{#380}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
