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A SharedBitmapId must be unique and should only be registered with
the display compositor once (and is implicitly unregistered if the
CompositorFrameSink is lost that it was registered to). Crash the
renderer if it violates this principle on a single CompositorFrameSink
so we can help track down why this is happening.

R=kylechar@chromium.org

Bug: 862584
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I37f36d0e4be20c5313c92e9e3a319803c0a58aaf
Reviewed-on: https://chromium-review.googlesource.com/1153467Reviewed-by: kylechar <kylechar@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578751}