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Without access to the shared main thread context,
VideoFrame.createImageBitmap() is unable to handle texture-backed
frames.

This CL does not fix the issue, but it does change it from a check
failure to a DOMException.

Bug: 1148849
Change-Id: I3f8c292022dc3cb8fd6625591d2384511e253ac2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2552901
Commit-Queue: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Chrome Cunningham <chcunningham@chromium.org>
Auto-Submit: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829865}