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In viz, the display compositor owns the context provider, and as the
display compositor is getting destroyed, the context provider should be
destroyed at the same time. Objects created by the GLRendererCopier
has been the only ones keeping the context provider alive longer than
the display compositor. This change will fail copy requests when the
display compositor is getting destroyed.


Bug: 1096487
Change-Id: I3cedd70dff42ed7ef9f946ec4b34017d3560df7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2253159
Commit-Queue: weiliangc <weiliangc@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802424}