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This CL finishes the video thumbnail pipeline for most codec except
vp8, vp9. Now it's ready to hook to the UI frontend. It does following:

1. Render the video frame with existing media toolkit, which can read
back pixel data from a texture in GPU process.

2. Plumbs a few metadata fields and thumbnail bitmap to Java layer.

Bug: 826021
Change-Id: Id6635975726f4b12ab51e01cb6b3e78a198632f4
Reviewed-on: https://chromium-review.googlesource.com/1222694Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591406}