Add more checks to diagnose MediaQuerySet issue

Add more checks to diagnose MediaQuerySet issue

Adding more CHECKs to diagnose the MediaQuerySet related crashers.

BUG=699269
Review-Url: https://codereview.chromium.org/2835633002
Cr-Commit-Position: refs/heads/master@{#466556}
Committed: https://chromium.googlesource.com/chromium/src/+/8b1af150d41e5cf5264929e3c7bd5c7f55f05390

[keishi, 2017-04-21 08:33:54]

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

[commit-bot: I haz the power, 2017-04-21 08:34:03]

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

[keishi, 2017-04-21 10:19:35]

Description was changed from

==========
Add checks

BUG=
==========

to

==========
Add more checks to diagnose MediaQuerySet issue

Adding more CHECKs to diagnose the MediaQuerySet related crashers.

BUG=699269
==========

[keishi, 2017-04-21 10:21:53]

keishi@chromium.org changed reviewers:
+ haraken@chromium.org, oilpan-reviews@chromium.org

[keishi, 2017-04-21 10:21:53]

PTAL

[keishi, 2017-04-21 10:22:03]

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

[commit-bot: I haz the power, 2017-04-21 10:22:19]

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

[sof, 2017-04-21 10:33:50]

sigbjornf@opera.com changed reviewers:
+ sigbjornf@opera.com

[sof, 2017-04-21 10:33:50]

lgtm

[haraken, 2017-04-21 10:51:54]

LGTM

https://codereview.chromium.org/2835633002/diff/20001/third_party/WebKit/Sour...
File third_party/WebKit/Source/core/dom/DocumentStyleSheetCollection.cpp
(right):

https://codereview.chromium.org/2835633002/diff/20001/third_party/WebKit/Sour...
third_party/WebKit/Source/core/dom/DocumentStyleSheetCollection.cpp:53:
CHECK(HeapObjectHeader::FromPayload(this)->IsValid());

Add a TODO to remove the checks once the investigation is done.

[commit-bot: I haz the power, 2017-04-21 12:13:08]

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

[commit-bot: I haz the power, 2017-04-21 12:13:08]

Dry run: This issue passed the CQ dry run.

[keishi, 2017-04-23 03:51:43]

The CQ bit was checked by keishi@chromium.org

[keishi, 2017-04-23 03:51:44]

The patchset sent to the CQ was uploaded after l-g-t-m from
haraken@chromium.org, sigbjornf@opera.com
Link to the patchset: https://codereview.chromium.org/2835633002/#ps40001
(title: "added comment")

[commit-bot: I haz the power, 2017-04-23 03:51:53]

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, 2017-04-23 05:29:24]

CQ is committing da patch.

Bot data: {"patchset_id": 40001, "attempt_start_ts": 1492919503797520,
"parent_rev": "92a6fb2bc85e4563090de085d19c39be8bc3b795", "commit_rev":
"8b1af150d41e5cf5264929e3c7bd5c7f55f05390"}

[commit-bot: I haz the power, 2017-04-23 05:30:18]

Description was changed from

==========
Add more checks to diagnose MediaQuerySet issue

Adding more CHECKs to diagnose the MediaQuerySet related crashers.

BUG=699269
==========

to

==========
Add more checks to diagnose MediaQuerySet issue

Adding more CHECKs to diagnose the MediaQuerySet related crashers.

BUG=699269

Review-Url: https://codereview.chromium.org/2835633002
Cr-Commit-Position: refs/heads/master@{#466556}
Committed:
https://chromium.googlesource.com/chromium/src/+/8b1af150d41e5cf5264929e3c7bd...
==========

[commit-bot: I haz the power, 2017-04-23 05:30:19]

Committed patchset #3 (id:40001) as
https://chromium.googlesource.com/chromium/src/+/8b1af150d41e5cf5264929e3c7bd...