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GpuMemoryBufferVideoFramePool uses RGBA/BGRA as the output format for
I420A video frames, and those are promoted to overlays on all platforms.
This causes SwapBuffers to fail in the GPU process on Windows since the
direct composition path can only handle YUV video.  This wasn't a
problem until we started promoting TextureDrawQuads to overlays in
crrev.com/c/1746796 assuming that the is_overlay_candidate flag would
only be set for low latency canvas that uses a swap chain.

A pixel test with yuva420p vp9 video is added.  The video was generated
using the following ffmpeg command:

ffmpeg -i four-colors.mp4 -filter_complex \
"color=c=#7F7F7F7F:s=960x540:rate=12[a];[0][a]alphamerge,format=yuva420p" \
-c:v libvpx-vp9 -auto-alt-ref 0 four-colors-vp9-i420a.webm

Bug: 1005028
Change-Id: Idc84d29c588cf3b9273fb605b2542be5441d61d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1829556
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702590}