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Add a bunch of new tests to cover CopyVideoFrameTexturesToGLTexture and
Paint/Copy for when the source VideoFrame contains GPU textures.

This uncovered an issue where in one particular case the frame was
incorrectly cropped twice when copying a RGBA texture frame, which this
patch also fixes.

Bug: 969201
Change-Id: Id402a85840397522cd6b5c5e44bfe03abdc90f0f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1697529
Auto-Submit: Antoine Labour <piman@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676617}