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When a renderer or other viz client shuts down, the CompositorFrameSink
may not have been notified about all the SharedBitmapIds being deleted.
In that case the shared memory would stay in the display compositor's
ServerSharedBitmapManager forever, leaking that memory space. So have
each CompositorFrameSink implementation remember what SharedBitmapIds
it has told the display compositor about, and remove them all when the
implementation is destroyed.

R=kylechar@chromium.org
NOTRY=true

Bug: 730660
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: Ia1aff6f9035b4713ece787f49ceb1d6c0f839c15
Reviewed-on: https://chromium-review.googlesource.com/929989
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#538957}