[webcodecs] Implement VideoFrame.readInto() and allocationSize() #28803
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This CL implements readInto() and allocationSize(), but only for frames
that are already supported by the |planes| API. Readback for mailbox
frames will be added in a followup CL.
Bug: 1176464
Change-Id: I92a12c20d1d9d05aba65abd129e17a21f92639cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2854880
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#878728}