Fix crash of paint invalidation tracking after a new frame is created

Fix crash of paint invalidation tracking after a new frame is created

BUG=645950
Committed: https://crrev.com/50d3fe174312ef3858b4c53d3496684106a86ebe
Cr-Commit-Position: refs/heads/master@{#418164}

[Xianzhu, 2016-09-12 21:41:04]

wangxianzhu@chromium.org changed reviewers:
+ chrishtr@chromium.org

[Xianzhu, 2016-09-12 21:41:04]

This CL may look familiar to you if you reviewed Patch Set 5 (has been deleted)
of https://codereview.chromium.org/2333513003/. I made a mistake that I uploaded
the two CLs mixed up together as that patch set.

[chrishtr, 2016-09-12 21:42:23]

lgtm

[Xianzhu, 2016-09-12 21:45:31]

The CQ bit was checked by wangxianzhu@chromium.org

[Xianzhu, 2016-09-12 21:45:49]

The CQ bit was unchecked by wangxianzhu@chromium.org

[Xianzhu, 2016-09-12 21:55:30]

The CQ bit was checked by wangxianzhu@chromium.org

[commit-bot: I haz the power, 2016-09-12 21:56:27]

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

[Xianzhu, 2016-09-12 22:01:04]

The CQ bit was checked by wangxianzhu@chromium.org

[Xianzhu, 2016-09-12 22:01:05]

The patchset sent to the CQ was uploaded after l-g-t-m from
chrishtr@chromium.org
Link to the patchset: https://codereview.chromium.org/2332973002/#ps20001
(title: "platform-neutual")

[commit-bot: I haz the power, 2016-09-12 22:01:43]

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, 2016-09-13 02:31:56]

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

[commit-bot: I haz the power, 2016-09-13 02:31:57]

Try jobs failed on following builders:
  win_chromium_rel_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

[Xianzhu, 2016-09-13 02:32:47]

The CQ bit was checked by wangxianzhu@chromium.org

[commit-bot: I haz the power, 2016-09-13 02:33:02]

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, 2016-09-13 03:56:29]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-09-13 03:58:42]

Description was changed from

==========
Fix crash of paint invalidation tracking after a new frame is created

BUG=645950
==========

to

==========
Fix crash of paint invalidation tracking after a new frame is created

BUG=645950

Committed: https://crrev.com/50d3fe174312ef3858b4c53d3496684106a86ebe
Cr-Commit-Position: refs/heads/master@{#418164}
==========

[commit-bot: I haz the power, 2016-09-13 03:58:43]

Patchset 2 (id:??) landed as
https://crrev.com/50d3fe174312ef3858b4c53d3496684106a86ebe
Cr-Commit-Position: refs/heads/master@{#418164}