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Originally DmabufVideoFramePool allocates frames by VideoFrameLayout,
which mainly contains VideoPixelFormat and frame size.
VideoPixelFormat is a enum that lists well-known pixel formats.
However, we might need buffers with proprietary format during
hardware-accelerated video decoding.

To support that, we should use fourcc, which could also list
proprietary formats, to indicate pixel format. This CL changes
DmabufVideoFramePool to allocate frames by Fourcc instead of
VideoPixelFormat.

Bug: 1004727
Test: Run video_decode_accelerator_tests on Kevin and Eve
Test: media_unittests --gtest_filter=FourccTest.*
Test: media_unittests --gtest_filter=PlatformVideoFramePoolTest.*

Change-Id: Ibebea0a93589d26c8c892585789301ca11dfb5ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895251
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715657}