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Also changes GfxBufferFormatToVideoPixelFormat to return nullopt when
the input GFX format is invalid instead of crashing through LOG(FATAL).

Bug: 982201, 997581
Change-Id: Id98fe66dbc82dc9d520623296f92107bd1dc8707
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1792362
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695063}