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This code path de-duplicates video uploads to textures, but something
is wrong with the de-duplication logic and it's causing video frames
to sometimes not be uploaded when they need to be.

The WebGL conformance tests run on the waterfall with
--enable-experimental-web-platform-features in order to exercise
some upcoming features, but this particular one must be disabled for
reliable test execution.

This experiment can be manually enabled with the command line flag
--enable-blink-features=ExtraWebGLVideoTextureMetadata .

Moved the layout test verifying this functionality into its own
virtual test suite.

Bug: 830901
Change-Id: Ic7bc75cd71f6a8d74ce85ded6153fb9782f73eb6
Reviewed-on: https://chromium-review.googlesource.com/c/1264542
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597379}