Garcefully handle glCreateGpuMemoryBufferImageCHROMIUM failure.

Creates a black frame instead of CHECKing if gl context is lost
or glCreateGpuMemoryBufferImageCHROMIUM fails. The default platform
for ozone (headless), used for content_browsertests on cast bots,
does not support Pixmaps.

BUG=641559

Review-Url: https://codereview.chromium.org/2298913002
Cr-Commit-Position: refs/heads/master@{#415865}
2 files changed