commit 1193f1696086ae64d6226225d12e77c3c78a84a6
author xlai <xlai@chromium.org> Fri Jul 15 02:04:24 2016
committer Commit bot <commit-bot@chromium.org> Fri Jul 15 02:07:10 2016
tree f83f762efdf0a5e09f82b0213a5c6acc0ac31d97
parent a86b6af35f1a0517008fa1a7763165b4e4ffba14

Transfer components of SurfaceId in OffscreenCanvas

OffscreenCanvas should keep the SurfaceId from its associated HTMLCanvasElement
so that when it is transferred to worker thread, it can directly submit
CompositorFrame to browser without going through main thread.

This is a preparation step before submiting CompositorFrame to Surface from
either main or worker thread.

BUG=611796

Review-Url: https://codereview.chromium.org/2143033005
Cr-Commit-Position: refs/heads/master@{#405673}