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This CL fixes the size of SurfaceQuad that used to embed root renderer
content. Previously it was assumed to be viewport size, this CL changes
it to CompositorFrame size.

Bug: 805739
Change-Id: I035f5928bd2cb57c6cc6ffd301d8f6e363d28ca2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2096114Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Vasiliy Telezhnikov <vasilyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748803}