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This is a reland of b71115a3

Relanding after triaging Gold failures on gpu.fyi bots in previous
attempt.

Original change's description:
> media: Use GL_UNPACK_ROW_LENGTH for software planes stride adaptation
>
> 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/+/2386671
> Reviewed-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}

TBR=dalecurtis@chromium.org,zmo@chromium.org

Bug: 1077211, 1124215
Change-Id: I43a97e72cdd0ba633d4b374a2319fbc7dc7252f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2390958Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803960}