Multiplanar: Add GetVideoColorSpace() for various decoders

This change adds GetVideoColorSpace() that returns the color space
set to the CodecPicture for various decoders - av1, h264, h265, vp8
and vp9. It stores the VideoColorSpace within decoder which is then
used for comparison with the new color space set based on preference
between key frame's color space (header) and the container color
space. Upon differences in color space, a ColorSpaceChange is triggered
which recreates picture buffers and in turn recreates shared images.

Bug: 1444189
Change-Id: I232838233c365a0e01c87c26e289e6a7766b4726
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4567152
Commit-Queue: Saifuddin Hitawala <hitawala@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1151419}

• media/gpu/accelerated_video_decoder.h[diff]
• media/gpu/av1_decoder.cc[diff]
• media/gpu/av1_decoder.h[diff]
• media/gpu/h264_decoder.cc[diff]
• media/gpu/h264_decoder.h[diff]
• media/gpu/h265_decoder.cc[diff]
• media/gpu/h265_decoder.h[diff]
• media/gpu/vaapi/vaapi_video_decode_accelerator_unittest.cc[diff]
• media/gpu/vp8_decoder.cc[diff]
• media/gpu/vp8_decoder.h[diff]
• media/gpu/vp9_decoder.cc[diff]
• media/gpu/vp9_decoder.h[diff]