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Avoid a CPU side copy to account for mismatched strides between the
decoded video frame and GPU texture created for uploading the frame.
GL_UNPACK_ROW_LENGTH allows specifying the stride for glTexSubImage2D,
and is part of the GL_EXT_unpack_subimage extension implemented by the
command buffer on the client side.

Also includes a pixel test with a VP8 video with a GL incompatible
stride that doesn't match the video's coded size (992 vs 962).

Bug: 1077211
Change-Id: I62753234bde3b92e64089c92a59e65ae2bc1c84c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2386671Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803696}