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It does not even use all the fields in the struct, just store a
viz::ResourceId and a gfx::Size directly. This drops a dependency
on cc/resources/ stuff that isn't needed for the display compositor.

R=piman@chromium.org
TBR=boliu

Bug: 722935
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I598c371e2560c7ad8365652e5d6729d9c5e5a849
Reviewed-on: https://chromium-review.googlesource.com/850740
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#527148}