Avoid always style recalc when removing stylesheets.

Avoid always style recalc when removing stylesheets.

Replaced FullStyleUpdate with AnalyzedStyleUpdate when:
- CSSStyleSheet::didMutate() is invoked from clearOwnerNode().
- StyleElement::removedFromDocument is invoked.

Modified StyleSheetCollection::analyzeStyleSheetChange when stylesheet contents are just removed:
- use Reset for StyleResolverUpdateType.
- use StyleInvalidationAnalysis for style recalc.


BUG=305885
TEST=All existing tests should pass after applying this patch.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=159957

[tasak, 2013-10-17 09:34:08]

I manually checked http://jsfiddle.net/GL4aE/ and confirmed that we could avoid
style recalc.

[eseidel, 2013-10-17 15:53:11]

lgtm

https://codereview.chromium.org/27537009/diff/1/Source/core/css/resolver/Styl...
File Source/core/css/resolver/StyleResolver.cpp (right):

https://codereview.chromium.org/27537009/diff/1/Source/core/css/resolver/Styl...
Source/core/css/resolver/StyleResolver.cpp:214: // FIXME: When chanking scoped
attribute, scopingNode's hasScopedHTMLStyleChild has been already modified.
"changing" I think.

[commit-bot: I haz the power, 2013-10-17 15:53:23]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/tasak@google.com/27537009/1

[commit-bot: I haz the power, 2013-10-17 19:37:48]

Retried try job too often on mac_blink_rel for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac_blink_...

[eseidel, 2013-10-17 20:20:16]

Assuming it was a flake.  The test does append a stylesheet so it's possible
it's hitting a bug:
https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit...

[commit-bot: I haz the power, 2013-10-17 20:28:31]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/tasak@google.com/27537009/1

[commit-bot: I haz the power, 2013-10-17 23:56:00]

Retried try job too often on mac_blink_rel for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac_blink_...

[commit-bot: I haz the power, 2013-10-18 04:10:29]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/tasak@google.com/27537009/1

[commit-bot: I haz the power, 2013-10-18 18:13:40]

Change committed as 159957

[eseidel, 2013-10-22 00:18:34]

Bah.  Wrong issue.