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CreateGpuMemoryBufferHandle() creates GpuMemoryBufferHandle from
media::VideoFrame(). The fds and metadata are come from untrusted processes,
e.g., ARC++ and renderer process. We must validate GpuMemoryBufferHandle.

Bug: None
Test: video_encode_accelerator_unittest on eve
Change-Id: I74faf5f9a38562d7120cc09d76dbaeb0d67515eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1839323
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Reviewed-by: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703614}