media/gpu/PlatformVideoFrame: Add function to create DmaBuf-backed VideoFrame using NativePixmap

VideoFrame only has the function to create DmaBuf-backed VideoFrame with already
created DmaBuf fds, WrapExternalDmabufs(). This adds a function to create Dmabuf-backed
VideoFrame usintg NativePixmap, CreatePlatformVideoFrame. The function is currently
supported on only Ozone platform.

Bug: 910590
Test: VDA and VEA unittest on exynos
Change-Id: I726369deecbdf9f1ae70829b36e59c72034feeae
Reviewed-on: https://chromium-review.googlesource.com/c/1358198
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614233}
11 files changed