Skip child ShadowRoots when invalidation does not have boundary crossing rules

Source/core/css/RuleFeature.h

Index: Source/core/css/RuleFeature.h
diff --git a/Source/core/css/RuleFeature.h b/Source/core/css/RuleFeature.h
index d380fc983077ac977bdd02fe6660449dbd2a8221..bc098d8924483735be039798e8a495e5eb922f54 100644
--- a/Source/core/css/RuleFeature.h
+++ b/Source/core/css/RuleFeature.h
@@ -148,17 +148,23 @@ private:
     InvalidationSetMode updateInvalidationSets(const CSSSelector&);
 
     struct InvalidationSetFeatures {
-        InvalidationSetFeatures() : customPseudoElement(false) { }
+        InvalidationSetFeatures()
+            : customPseudoElement(false)
+            , treeBoundaryCrossing(false)
+            , wholeSubtree(false)
+        { }
         Vector<AtomicString> classes;
         Vector<AtomicString> attributes;
         AtomicString id;
         AtomicString tagName;
         bool customPseudoElement;
+        bool treeBoundaryCrossing;
+        bool wholeSubtree;

[rune, 2014/05/30 21:02:45]

Me likes the way this made the .cpp code more readable.

     };
 
     static void extractInvalidationSetFeature(const CSSSelector&, InvalidationSetFeatures&);
     const CSSSelector* extractInvalidationSetFeatures(const CSSSelector&, InvalidationSetFeatures&);
-    void addFeaturesToInvalidationSets(const CSSSelector&, const InvalidationSetFeatures&, bool wholeSubtree);
+    void addFeaturesToInvalidationSets(const CSSSelector&, InvalidationSetFeatures&);
 
     void addClassToInvalidationSet(const AtomicString& className, Element&);