Correctly re-collect active style for html imports.

Correctly re-collect active style for html imports.

- Need to re-collect active stylesheets when inserting already cached
  import documents.

- Missing markDocumentDirty() when inserting import documents.

- Added test for missing coverage of the need for marking for re-
  collection from HTMLImportChild::ownerInserted().

The fact that we need to recollect sheets in the document scope and
recalculate style for the whole document is not a perf regression, this
is how it used to be before considering the async stylesheet update
with ruleset invalidations, but ideally we would like to do better.
It's unlikely a common use case as html imports are typically loaded in
head as script and rendering blocking.

R=meade@chromium.org
BUG=567021
Committed: https://crrev.com/2e3e5148b008e60b37270fec3f6099914550a310
Cr-Commit-Position: refs/heads/master@{#436238}

[rune, 2016-12-02 14:10:26]

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

[commit-bot: I haz the power, 2016-12-02 14:10:40]

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, 2016-12-02 15:37:51]

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

[commit-bot: I haz the power, 2016-12-02 15:37:52]

Dry run: This issue passed the CQ dry run.

[meade_UTC10, 2016-12-05 03:05:37]

lgtm

[rune, 2016-12-05 05:46:44]

The CQ bit was checked by rune@opera.com

[commit-bot: I haz the power, 2016-12-05 05:46:55]

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, 2016-12-05 07:22:13]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1480916804484460, "parent_rev":
"e4e2d0389b2da075785de64b87f4fc984c62f38c", "commit_rev":
"d0edce0f632f4d7da0dd2673c13e559eb6ac2405"}

[commit-bot: I haz the power, 2016-12-05 07:22:36]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-12-05 07:23:59]

Description was changed from

==========
Correctly re-collect active style for html imports.

- Need to re-collect active stylesheets when inserting already cached
  import documents.

- Missing markDocumentDirty() when inserting import documents.

- Added test for missing coverage of the need for marking for re-
  collection from HTMLImportChild::ownerInserted().

The fact that we need to recollect sheets in the document scope and
recalculate style for the whole document is not a perf regression, this
is how it used to be before considering the async stylesheet update
with ruleset invalidations, but ideally we would like to do better.
It's unlikely a common use case as html imports are typically loaded in
head as script and rendering blocking.

R=meade@chromium.org
BUG=567021
==========

to

==========
Correctly re-collect active style for html imports.

- Need to re-collect active stylesheets when inserting already cached
  import documents.

- Missing markDocumentDirty() when inserting import documents.

- Added test for missing coverage of the need for marking for re-
  collection from HTMLImportChild::ownerInserted().

The fact that we need to recollect sheets in the document scope and
recalculate style for the whole document is not a perf regression, this
is how it used to be before considering the async stylesheet update
with ruleset invalidations, but ideally we would like to do better.
It's unlikely a common use case as html imports are typically loaded in
head as script and rendering blocking.

R=meade@chromium.org
BUG=567021

Committed: https://crrev.com/2e3e5148b008e60b37270fec3f6099914550a310
Cr-Commit-Position: refs/heads/master@{#436238}
==========

[commit-bot: I haz the power, 2016-12-05 07:24:00]

Patchset 1 (id:??) landed as
https://crrev.com/2e3e5148b008e60b37270fec3f6099914550a310
Cr-Commit-Position: refs/heads/master@{#436238}