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This makes D3D11VideoDecoder use the visible rect from the H264
decoder when constructing a VideoFrame.

Change-Id: Ic8a3095a86bb9282a6d1fcf06aed1cf6aeef60d7
Reviewed-on: https://chromium-review.googlesource.com/1217354Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590078}