Reland of Suppress memory leak from WebGraphicsContext3DCommandBufferImpl

Reland of Suppress memory leak from WebGraphicsContext3DCommandBufferImpl (patchset #1 id:1 of https://codereview.chromium.org/1411643004/ )

Reason for revert:
Couldn't do speculative revert due to conflict. I'll look into other CLs first.

Original issue's description:
> Revert of Suppress memory leak from WebGraphicsContext3DCommandBufferImpl (patchset #1 id:20001 of https://codereview.chromium.org/1428643002/ )
>
> Reason for revert:
> for speculative revert
>
> Original issue's description:
> > Suppress memory leak from WebGraphicsContext3DCommandBufferImpl
> >
> > BUG=548039
> > TBR=erikchen@chromium.org,reveman@chromium.org
> >
> > Committed: https://crrev.com/fb1a837f472bc9f004ccb8fa1c0d5f83acbeba4e
> > Cr-Commit-Position: refs/heads/master@{#356444}
>
> TBR=erikchen@chromium.org,reveman@chromium.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=548039
>
> Committed: https://crrev.com/eca678585491d769a57eb41b34cb0b79a8e050f0
> Cr-Commit-Position: refs/heads/master@{#356524}

TBR=erikchen@chromium.org,reveman@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=548039
Committed: https://crrev.com/3dc5ef2ff48fa435753e97cb431fa5360aa3355a
Cr-Commit-Position: refs/heads/master@{#356525}

[oshima, 2015-10-28 07:47:44]

Created Reland of Suppress memory leak from
WebGraphicsContext3DCommandBufferImpl

[commit-bot: I haz the power, 2015-10-28 07:47:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1427733002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1427733002/1

[commit-bot: I haz the power, 2015-10-28 07:48:26]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-28 07:49:00]

Patchset 1 (id:??) landed as
https://crrev.com/3dc5ef2ff48fa435753e97cb431fa5360aa3355a
Cr-Commit-Position: refs/heads/master@{#356525}