Update styleSheets list in import without active style update.

Update styleSheets list in import without active style update.

Querying document.styleSheets should not need to do a full active style
update. This CL is implementing a light-weight update of the styleSheets
list querying document.styleSheets on html import documents.

We collect and swap style_sheets_for_style_sheet_list_ for the
collection of the import document without touching the active style or
the dirty flags for active style on the master document. This is
straightforward for import documents as they don't have an active
stylesheet list themselves. Doing this optimization for top level
documents and shadow trees is the next step, but we need to be more
careful for those cases to keep the dirtyness without having to re-
collect for the styleSheets api every time.

BUG=717506
Review-Url: https://codereview.chromium.org/2880303002
Cr-Commit-Position: refs/heads/master@{#472751}
Committed: https://chromium.googlesource.com/chromium/src/+/b5049772af9303fbb1dcdfe233900dfc80700ca1

[rune, 2017-05-15 13:19:55]

The CQ bit was checked by rune@opera.com to run a CQ dry run

[commit-bot: I haz the power, 2017-05-15 13:20:06]

Dry run: CQ is trying da patch.

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

[rune, 2017-05-15 14:22:20]

rune@opera.com changed reviewers:
+ meade@chromium.org

[rune, 2017-05-15 14:22:20]

ptal

[commit-bot: I haz the power, 2017-05-15 14:41:50]

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

[commit-bot: I haz the power, 2017-05-15 14:41:51]

Dry run: Try jobs failed on following builders:
  mac_chromium_rel_ng on master.tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[meade_UTC10, 2017-05-16 07:09:49]

lgtm

[rune, 2017-05-16 08:20:03]

rune@opera.com changed reviewers:
+ jochen@chromium.org

[rune, 2017-05-16 08:20:03]

jochen@ for web/

[jochen (gone - plz use gerrit), 2017-05-16 11:16:36]

lgtm

[rune, 2017-05-17 14:27:21]

The CQ bit was checked by rune@opera.com

[commit-bot: I haz the power, 2017-05-17 14:27:40]

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, 2017-05-17 15:58:22]

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

[commit-bot: I haz the power, 2017-05-17 15:58:22]

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_...)

[rune, 2017-05-17 19:00:21]

The CQ bit was checked by rune@opera.com

[commit-bot: I haz the power, 2017-05-17 19:04:03]

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, 2017-05-17 21:24:41]

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

[commit-bot: I haz the power, 2017-05-17 21:24:42]

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_...)

[rune, 2017-05-18 09:17:59]

The CQ bit was checked by rune@opera.com

[commit-bot: I haz the power, 2017-05-18 09:18:27]

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, 2017-05-18 09:23:40]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1495099079088140, "parent_rev":
"31546fb25253afc574bf366d92ef20790c7d418c", "commit_rev":
"b5049772af9303fbb1dcdfe233900dfc80700ca1"}

[commit-bot: I haz the power, 2017-05-18 09:23:50]

Description was changed from

==========
Update styleSheets list in import without active style update.

Querying document.styleSheets should not need to do a full active style
update. This CL is implementing a light-weight update of the styleSheets
list querying document.styleSheets on html import documents.

We collect and swap style_sheets_for_style_sheet_list_ for the
collection of the import document without touching the active style or
the dirty flags for active style on the master document. This is
straightforward for import documents as they don't have an active
stylesheet list themselves. Doing this optimization for top level
documents and shadow trees is the next step, but we need to be more
careful for those cases to keep the dirtyness without having to re-
collect for the styleSheets api every time.

BUG=717506
==========

to

==========
Update styleSheets list in import without active style update.

Querying document.styleSheets should not need to do a full active style
update. This CL is implementing a light-weight update of the styleSheets
list querying document.styleSheets on html import documents.

We collect and swap style_sheets_for_style_sheet_list_ for the
collection of the import document without touching the active style or
the dirty flags for active style on the master document. This is
straightforward for import documents as they don't have an active
stylesheet list themselves. Doing this optimization for top level
documents and shadow trees is the next step, but we need to be more
careful for those cases to keep the dirtyness without having to re-
collect for the styleSheets api every time.

BUG=717506

Review-Url: https://codereview.chromium.org/2880303002
Cr-Commit-Position: refs/heads/master@{#472751}
Committed:
https://chromium.googlesource.com/chromium/src/+/b5049772af9303fbb1dcdfe23390...
==========

[commit-bot: I haz the power, 2017-05-18 09:23:52]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/b5049772af9303fbb1dcdfe23390...