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This CL adds new keys to VideoFrameMetadata's dictionary. These keys
will be used to store new types of information, to be surfaced via the
video.requestAnimationFrame() API.

Bug: 1012063
Change-Id: Ib937fbf762d00afca46f6c1552ea818ecb1b6584
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1904336
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Reviewed-by: Tommi <tommi@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714046}