commit 94a3a26405be3996569d9006b29d0460bb9e8dca
author xlai <xlai@chromium.org> Sat Sep 03 03:17:02 2016
committer Commit bot <commit-bot@chromium.org> Sat Sep 03 03:21:01 2016
tree ed35a99ad7254d0985159e4ea4a1f9dbbc3a7025
parent dd458e6dffeee1721b4c02ccf56d798cff02d1da

Submit Compositor Frame from OffscreenCanvas on main

CompositorFrame is to be submitted from OffscreenCanvas from
either main or worker thread (but not both at the same time);
therefore, another interface "OffscreenCanvasFrameReceiver"
is created only when commit() is invoked.

This CL follows the class design structure in this diagram:
www.lucidchart.com/documents/view/346a55cc-0ab1-48e8-9d34-90f59d36094e

Currently, we only submit a Green color frame for simplicity.
More CLs will follow to fill in image data to the compositor
frame.

BUG=563852

Review-Url: https://codereview.chromium.org/2294963002
Cr-Commit-Position: refs/heads/master@{#416436}