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The capture process knows nothing about whether or not hardware
acceleration is enabled, and cannot therefore be told not to send
GpuMemoryBuffers when there is no GpuMemoryBuffer support.

Add a path whereby a media::VideoFrame can be created to wrap an
IOSurface-backed gfx::GpuMemoryBufferHandle. This will be used when
the capture process gives Blink a GpuMemoryBuffer handle, but there no
longer exists hardware acceleration support (because of being disabled
statically or dynamically).

Bug: 1125879
Change-Id: Id87ca3d832e68a3501ed12540d3d265f23cd0362
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2415575
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808244}