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mus can delegate managing the gfx::AcceleratedWidget it creates to the
window manager. The window manager (i.e. ash/aura) in this case needs to
support injecting this AcceleratedWidget into its compositor.

BUG=786453

Change-Id: If9de911ab70e84e750728b0b46a8d4470c1e7da8
Reviewed-on: https://chromium-review.googlesource.com/792272Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519717}