Add type selector invalidation set for ruleset invalidations.

Add type selector invalidation set for ruleset invalidations.

We currently look at RuleSet::tagRules() to figure out if an element
needs a style recalc when adding a stylesheet. This recalculates too
much for rules like "#id span" which ends up in the tagRules bucket,
causing style recalcs for every span. The plan is to use an
m_typeRuleInvalidationSet which contains the tag names for rules which
don't contain other simple selectors which have associated invalidation
sets.

For instance, "#id span" will not add span to m_typeRuleInvalidationSet
since we can rely on the invalidation set for #id to invalidate spans.
However, "span" or "div span" will add span to that set.

This CL prepares for this by introducing the set and a way to collect
it. This new set will be scheduled on the root node of the TreeScope
when adding/removing a stylesheet. We did not support scheduling
invalidation sets on the document node, so this CL adds that
possibility as well.

BUG=680549
Review-Url: https://codereview.chromium.org/2699883002
Cr-Commit-Position: refs/heads/master@{#451170}
Committed: https://chromium.googlesource.com/chromium/src/+/47ac662b73ab95e33844fe6e6a9ce06104708ebb

[rune, 2017-02-16 15:28:37]

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

[commit-bot: I haz the power, 2017-02-16 15:29:03]

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, 2017-02-16 17:20:39]

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

[commit-bot: I haz the power, 2017-02-16 17:20:41]

Dry run: This issue passed the CQ dry run.

[rune, 2017-02-16 23:30:34]

rune@opera.com changed reviewers:
+ ericwilligers@chromium.org, sashab@chromium.org

[rune, 2017-02-16 23:30:34]

ptal

[Eric Willigers, 2017-02-17 00:29:00]

lgtm

[rune, 2017-02-17 00:36:25]

The CQ bit was checked by rune@opera.com

[commit-bot: I haz the power, 2017-02-17 00:37:55]

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, 2017-02-17 01:55:08]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1487291785794490, "parent_rev":
"bd4b24d3cb10b535d47005567c3d5589125585fe", "commit_rev":
"47ac662b73ab95e33844fe6e6a9ce06104708ebb"}

[commit-bot: I haz the power, 2017-02-17 01:56:08]

Description was changed from

==========
Add type selector invalidation set for ruleset invalidations.

We currently look at RuleSet::tagRules() to figure out if an element
needs a style recalc when adding a stylesheet. This recalculates too
much for rules like "#id span" which ends up in the tagRules bucket,
causing style recalcs for every span. The plan is to use an
m_typeRuleInvalidationSet which contains the tag names for rules which
don't contain other simple selectors which have associated invalidation
sets.

For instance, "#id span" will not add span to m_typeRuleInvalidationSet
since we can rely on the invalidation set for #id to invalidate spans.
However, "span" or "div span" will add span to that set.

This CL prepares for this by introducing the set and a way to collect
it. This new set will be scheduled on the root node of the TreeScope
when adding/removing a stylesheet. We did not support scheduling
invalidation sets on the document node, so this CL adds that
possibility as well.

BUG=680549
==========

to

==========
Add type selector invalidation set for ruleset invalidations.

We currently look at RuleSet::tagRules() to figure out if an element
needs a style recalc when adding a stylesheet. This recalculates too
much for rules like "#id span" which ends up in the tagRules bucket,
causing style recalcs for every span. The plan is to use an
m_typeRuleInvalidationSet which contains the tag names for rules which
don't contain other simple selectors which have associated invalidation
sets.

For instance, "#id span" will not add span to m_typeRuleInvalidationSet
since we can rely on the invalidation set for #id to invalidate spans.
However, "span" or "div span" will add span to that set.

This CL prepares for this by introducing the set and a way to collect
it. This new set will be scheduled on the root node of the TreeScope
when adding/removing a stylesheet. We did not support scheduling
invalidation sets on the document node, so this CL adds that
possibility as well.

BUG=680549

Review-Url: https://codereview.chromium.org/2699883002
Cr-Commit-Position: refs/heads/master@{#451170}
Committed:
https://chromium.googlesource.com/chromium/src/+/47ac662b73ab95e33844fe6e6a9c...
==========

[commit-bot: I haz the power, 2017-02-17 01:56:09]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/47ac662b73ab95e33844fe6e6a9c...