commit 88c843775504c8beb480aae0f62c02791ecbb108
author Yuta Kitamura <yutak@chromium.org> Fri Sep 28 12:33:54 2018
committer Commit Bot <commit-bot@chromium.org> Fri Sep 28 12:33:54 2018
tree d9a1550087fc3f7b5abe407992bf030bb66c8433
parent c465ab4014a8793ffd9aabdb058441fbec76ee90

Move most of compositor thread's initialization to Platform.

This CL moves most of the actual work of initializing compositor thread
from RenderThreadImpl to Platform. This further reduces //content's
dependency to WebThread.

A new virtual function is introduced to Platform so we can change the
thread priority of the created compositor thread on Linux, where we need
to talk to the browser process to change the thread priority.

Additionally, a new function Platform::CompositorThreadTaskRunner() is
introduced, because RenderThreadImpl needs to post tasks to the
compositor thread after the thread is initialized.

Bug: 826203
Change-Id: Ic80e6452cdfe8af25ae2b277125687854859d106
Reviewed-on: https://chromium-review.googlesource.com/1249424
Commit-Queue: Yuta Kitamura <yutak@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595063}