tree f17a716e9eabf16b0132c24ccdf0138aa1ab69b4
parent 3d8ebe3a1a270361f51b6777dd328ef288115437
author piman <piman@chromium.org> 1431056581 -0700
committer Commit bot <commit-bot@chromium.org> 1431056617 +0000

Fix GpuChannelHost destruction and races

https://codereview.chromium.org/583043005 introduced
GpuChannelHost::DestroyChannel but it introduced a new state to GpuChannelHost
which was not captured everywhere and had races.

1- Ensure GpuChannelHost::DestroyChannel is always called on the main thread, before destruction.
2- properly handle the channel_ == NULL state.
3- Fix races (channel_ is used on any thread on windows, must be locked)

Also make sure contexts are destroyed before the channel, for sanity.

BUG=451456,471822

Review URL: https://codereview.chromium.org/1128233004

Cr-Commit-Position: refs/heads/master@{#328917}