Add missing lock in RetireSyncPointOnGpuThread

Add missing lock in RetireSyncPointOnGpuThread

BUG=394491
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=284351

[boliu, 2014-07-19 00:31:04]

Didn't feel like factoring out a helper, and wanted to keep only the lock for
MakeCurrent, so a bit wordy.

Although not all of MakeCurrent needs the lock, only part of it. Maybe
MakeCurrent (and all the other things that needs the lock) should take the lock
as an argument, since AutoLock supports nesting.

[boliu, 2014-07-19 00:47:29]

On 2014/07/19 00:31:04, boliu wrote:
> Didn't feel like factoring out a helper, and wanted to keep only the lock for
> MakeCurrent, so a bit wordy.
> 
> Although not all of MakeCurrent needs the lock, only part of it. Maybe
> MakeCurrent (and all the other things that needs the lock) should take the
lock
> as an argument, since AutoLock supports nesting.

Scratch that bit about AutoLock supporting recursion. I'm drunk.

[no sievers, 2014-07-19 01:31:01]

lgtm

[boliu, 2014-07-19 19:26:31]

The CQ bit was checked by boliu@chromium.org

[commit-bot: I haz the power, 2014-07-19 19:27:39]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/boliu@chromium.org/407683002/20001

[commit-bot: I haz the power, 2014-07-19 23:17:58]

Change committed as 284351