commit d5bd60f820f57b8c3326ee5993652100780013d1
author Hajime Hoshi <hajimehoshi@chromium.org> Fri May 25 13:32:04 2018
committer Commit Bot <commit-bot@chromium.org> Fri May 25 13:32:04 2018
tree 8576bcfb5a90f6dc36a4794ca5cb60a84f5bd5ce
parent 1c8d34f6f3b1efbc7faf42c3282058629a904a0d

Add TaskType::kWorkerThreadTaskQueueCompositor and use it for compositors

Before this CL, null was passed to Mojo binding as a compositor task
runner in offscreen canvas on worker thread as NonMainThreadTaskRunner::
CompositorTaskRunner() returns null. In this case,
SingleThreadTaskRunner::Get() was used internally Mojo.

This CL implements WorkerThreadScheduler::CompositorTaskRunner() with
a new task type kWorkerThreadTaskQueueCompositor so that we can know the
task runner's usage on UMA for task duration per task type.

Bug: 841172
Change-Id: I8caf3244169300aed45eeab4fcd01999bc823976
Reviewed-on: https://chromium-review.googlesource.com/1073169
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561847}