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Currently, we use VideoFrameLayout to store the physical layout of
video frame buffers. VideoFrameLayout uses VideoFrameLayout to
indicate the buffer format. However in GPU buffer usage, we have to
handle proprietary format, which is not listed in VideoPixelFormat.

This CL introduces a new class "GpuBufferLayout", which is planned to
replace VideoFrameLayout inside media/gpu/chromeos.

Bug: 1004727
Test: ninja media/gpu/chromeos:common

Change-Id: Iaac1b1c76ac6b9dace7e4b790a9161de17e3342a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899228
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715615}