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In preparation for adding more tests to D3D11VideoDecoder, this CL
converts use of the command decoder stub to CommandBufferHelper.
Otherwise, we have to mock out the stub for the test.

Change-Id: I4234841d26dbb0187e626cfd20d534916506b8d4
Reviewed-on: https://chromium-review.googlesource.com/c/1343340
Commit-Queue: Frank Liberato <liberato@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610194}