Added tests for preferred sheet insertion order.

Added tests for preferred sheet insertion order.

Which stylesheet wins setting the preferred stylesheet set based on the
title attribute depends on the insertion order, and not the tree order,
since it's done as part of adding a stylesheet[1], as part of creating
a stylesheet[2], which is done on closing a style element, on inserting
or removing the style element [3].

Added two tests to make sure this is still true after active stylesheet
update has been made async.

[1] https://drafts.csswg.org/cssom/#add-a-css-style-sheet
[2] https://drafts.csswg.org/cssom/#create-a-css-style-sheet
[3] https://html.spec.whatwg.org/#update-a-style-block

BUG=567021
Committed: https://crrev.com/861066b09b34f5644e622d195ff2f4609502c364
Cr-Commit-Position: refs/heads/master@{#379760}

[rune, 2016-03-07 09:51:14]

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

[commit-bot: I haz the power, 2016-03-07 09:51:21]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1769843002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1769843002/1

[commit-bot: I haz the power, 2016-03-07 10:57:32]

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

[commit-bot: I haz the power, 2016-03-07 10:57:33]

Dry run: This issue passed the CQ dry run.

[rune, 2016-03-07 19:22:11]

rune@opera.com changed reviewers:
+ dstockwell@chromium.org, esprehn@chromium.org

[esprehn, 2016-03-08 05:58:22]

Blech, such an awful feature. lgtm

[esprehn, 2016-03-08 05:58:23]

The CQ bit was checked by esprehn@chromium.org

[commit-bot: I haz the power, 2016-03-08 05:58:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1769843002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1769843002/1

[commit-bot: I haz the power, 2016-03-08 06:03:33]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-08 06:04:48]

Description was changed from

==========
Added tests for preferred sheet insertion order.

Which stylesheet wins setting the preferred stylesheet set based on the
title attribute depends on the insertion order, and not the tree order,
since it's done as part of adding a stylesheet[1], as part of creating
a stylesheet[2], which is done on closing a style element, on inserting
or removing the style element [3].

Added two tests to make sure this is still true after active stylesheet
update has been made async.

[1] https://drafts.csswg.org/cssom/#add-a-css-style-sheet
[2] https://drafts.csswg.org/cssom/#create-a-css-style-sheet
[3] https://html.spec.whatwg.org/#update-a-style-block

BUG=567021
==========

to

==========
Added tests for preferred sheet insertion order.

Which stylesheet wins setting the preferred stylesheet set based on the
title attribute depends on the insertion order, and not the tree order,
since it's done as part of adding a stylesheet[1], as part of creating
a stylesheet[2], which is done on closing a style element, on inserting
or removing the style element [3].

Added two tests to make sure this is still true after active stylesheet
update has been made async.

[1] https://drafts.csswg.org/cssom/#add-a-css-style-sheet
[2] https://drafts.csswg.org/cssom/#create-a-css-style-sheet
[3] https://html.spec.whatwg.org/#update-a-style-block

BUG=567021

Committed: https://crrev.com/861066b09b34f5644e622d195ff2f4609502c364
Cr-Commit-Position: refs/heads/master@{#379760}
==========

[commit-bot: I haz the power, 2016-03-08 06:04:49]

Patchset 1 (id:??) landed as
https://crrev.com/861066b09b34f5644e622d195ff2f4609502c364
Cr-Commit-Position: refs/heads/master@{#379760}