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Eric Karl authoredMany of our current issues turned out to be due to missing shutdown logic which caused the GPU thread to shutdown before the compositor, leading to a number of DCHECKs, and a hang if those were removed. This change allows the CompositorImpl to tear down before the GPU proc. Bug: 851643 Change-Id: Ieb96da9b7132e4ccf8ebf71dc0ee920bfbeb4217 Reviewed-on: https://chromium-review.googlesource.com/1115875Reviewed-by: Ted Choc <tedchoc@chromium.org> Commit-Queue: Eric Karl <ericrk@chromium.org> Cr-Commit-Position: refs/heads/master@{#570880} f3d07b7a