commit 2b64c2dba2ed0743c08b4c08e729f32661f5a9b1
author Sunny Sachanandani <sunnyps@chromium.org> Fri Nov 30 00:29:04 2018
committer Commit Bot <commit-bot@chromium.org> Fri Nov 30 00:29:04 2018
tree 2f55a5a145e00e41ee0771e76e4eb83dd2a785ab
parent adb34adefcbd7343284ad3500b624197efeb6600

GPU scheduler thread safety fixes

Two fixes:
1) Create a weak ptr on main thread before use to prevent data race on
   calling GetWeakPtr() from multiple threads.
2) Ensure sync token release callback is called on main thread so that
   the weak ptr is not dereferenced on another thread.  Sync tokens
   aren't released on any other thread today, but that might change with
   ChromeOS image decode accelerator work, and using WaitNonThreadSafe()
   will not post a task if on the same thread anyway.

Bug: 908669
Change-Id: I0bd9e0d56fe94c750513bc792e9e632bb83b30b9
Reviewed-on: https://chromium-review.googlesource.com/c/1352858
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612471}