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This CL allows Chrome and WebRTC to apply resolution adaptation with
GpuMemoryBuffer-based video frame.

GMB-based video frame soft-applies cropping and scaling by specifying
visible_rectangle and natural_size in the early stage of the processing
pipeline.  The actual cropping and scaling operations happen only when
either the frame is processed on the hardware (e.g. running hardware
encoder on GPU), or when the CPU really needs to access the frame data
(e.g. running software encoder).

Bug: 982201
Change-Id: Ib8f8278603188782f0657920a2140b71d4a4fc00
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1817861Reviewed-by: Henrik Boström <hbos@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702284}