StyleResolver should update RuleSets lazily.

Source/core/css/RuleSet.h

Index: Source/core/css/RuleSet.h
diff --git a/Source/core/css/RuleSet.h b/Source/core/css/RuleSet.h
index 7bae0c0dc8398d07311c12676ceebc8274c65eb0..155b9eeededc9337d60036842651b818e8198a6b 100644
--- a/Source/core/css/RuleSet.h
+++ b/Source/core/css/RuleSet.h
@@ -31,10 +31,11 @@
 namespace WebCore {
 
 enum AddRuleFlags {
-    RuleHasNoSpecialState         = 0,
-    RuleHasDocumentSecurityOrigin = 1,
-    RuleCanUseFastCheckSelector   = 1 << 1,
-    RuleIsInRegionRule            = 1 << 2,
+    RuleHasNoSpecialState            = 0,
+    RuleHasDocumentSecurityOrigin    = 1,
+    RuleCanUseFastCheckSelector      = 1 << 1,
+    RuleIsInRegionRule               = 1 << 2,
+    RuleSkipsFontFaceAndViewportRule = 1 << 3

[eseidel, 2013/11/06 01:39:10]

Does this mean you can have rules which ignore the fact that they're defined
inside an @font-face or @viewport?  I must be misunderstanding, as that doesn't
make sense to me...

[tasak, 2013/11/06 05:42:26]

I mean, if RuleSkipsFontFaceAndViewportRule is set, we will ignore @font-face
and @viewport in a given stylesheet.

Because the rules have been already processed in
filterFontFaceAndViewportRulesFromAuthorStyleSheets (invoked from
lazyAppendAuthorStyleSheets).

I'm using the flag to avoid invoking "addViewportRule" or "addFontFaceRule" from
appendPendingAuthorStyleSheets.

 };
 
 enum PropertyWhitelistType {
@@ -108,9 +109,10 @@ class RuleSet {
 public:
     static PassOwnPtr<RuleSet> create() { return adoptPtr(new RuleSet); }
 
-    void addRulesFromSheet(StyleSheetContents*, const MediaQueryEvaluator&, StyleResolver* = 0, const ContainerNode* = 0);
+    void addRulesFromSheet(StyleSheetContents*, const MediaQueryEvaluator&, StyleResolver* = 0, const ContainerNode* = 0, bool processFontFaceAndViewportRule = true);
     void addStyleRule(StyleRule*, AddRuleFlags);
     void addRule(StyleRule*, unsigned selectorIndex, AddRuleFlags);
+    void addViewportRule(StyleRuleViewport*);
 
     const RuleFeatureSet& features() const { return m_features; }
 
@@ -155,7 +157,6 @@ private:
 
     void addToRuleSet(StringImpl* key, PendingRuleMap&, const RuleData&);
     void addPageRule(StyleRulePage*);
-    void addViewportRule(StyleRuleViewport*);
     void addRegionRule(StyleRuleRegion*, bool hasDocumentSecurityOrigin, const ContainerNode* scope);
 
     void addChildRules(const Vector<RefPtr<StyleRuleBase> >&, const MediaQueryEvaluator& medium, StyleResolver*, const ContainerNode* scope, bool hasDocumentSecurityOrigin, AddRuleFlags);