Adding null pointer check in BaseRenderingContext2D::restoreMatrixClipStack

Adding null pointer check in BaseRenderingContext2D::restoreMatrixClipStack

BUG=648510
Review-Url: https://codereview.chromium.org/2610183002
Cr-Commit-Position: refs/heads/master@{#441772}
Committed: https://chromium.googlesource.com/chromium/src/+/7bce08ea4e4dc637356476938df381f60987e930

[Justin Novosad, 2017-01-04 18:56:15]

junov@chromium.org changed reviewers:
+ xlai@chromium.org

[Justin Novosad, 2017-01-04 18:56:16]

PTAL

[Justin Novosad, 2017-01-04 18:56:52]

The CQ bit was checked by junov@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-01-04 18:57:25]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-01-04 21:40:35]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-01-04 21:40:35]

Dry run: Try jobs failed on following builders:
  linux_chromium_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[xlai (Olivia), 2017-01-04 21:45:57]

On 2017/01/04 18:56:16, Justin Novosad wrote:
> PTAL

lgtm

[Justin Novosad, 2017-01-05 19:44:44]

The CQ bit was checked by junov@chromium.org

[commit-bot: I haz the power, 2017-01-05 19:44:57]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-01-05 22:20:07]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1483645484203950, "parent_rev":
"ae18bbf1c86ae6c94daefd7db49fcd7c660aa501", "commit_rev":
"7bce08ea4e4dc637356476938df381f60987e930"}

[commit-bot: I haz the power, 2017-01-05 22:20:36]

Description was changed from

==========
Adding null pointer check in BaseRenderingContext2D::restoreMatrixClipStack

BUG=648510
==========

to

==========
Adding null pointer check in BaseRenderingContext2D::restoreMatrixClipStack

BUG=648510

Review-Url: https://codereview.chromium.org/2610183002
Cr-Commit-Position: refs/heads/master@{#441772}
Committed:
https://chromium.googlesource.com/chromium/src/+/7bce08ea4e4dc637356476938df3...
==========

[commit-bot: I haz the power, 2017-01-05 22:20:38]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/7bce08ea4e4dc637356476938df3...