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This is a reland of 6a42b67c with a
test Pixel_Video_Context_Loss_VP9 being marked as failing on webview.

Original change's description:
> Update pixel video tests to use higher tolerance.
>
> 1. Update pixel video tests to use higher tolerance value for all
> formats on all devices. A tolerance of around 10% is required for
> all the pixel tests to match gold/color expectations on all the
> devices.
>
> 2. Add viewport metadata to the html page to scale correctly on mobile
> devices.
>
> 3. This CL fixes 5 pixel tests on android - Pixel_Video_MP4,
> Pixel_Video_MP4_FourColors_Aspect_4x3, Pixel_Video_MP4_FourColors_Rot_180,
> Pixel_Video_VP9 and Pixel_Video_Context_Loss_VP9. Remove the test
> expectations from pixel_expectations.txt.
>
> Bug: 925744
> Change-Id: I6d9dbd270dcc45e38f45826f98cf9035563b5f46
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1699401
> Commit-Queue: vikas soni <vikassoni@chromium.org>
> Reviewed-by: Kenneth Russell <kbr@chromium.org>
> Reviewed-by: Zhenyao Mo <zmo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#677548}

Bug: 925744
Change-Id: Ib0fb98627ac654c09b217e67bafef0412a9a9887
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1704392Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: vikas soni <vikassoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678378}