Add a fast-path for independent inherited properties

third_party/WebKit/Source/core/dom/Element.h

Index: third_party/WebKit/Source/core/dom/Element.h
diff --git a/third_party/WebKit/Source/core/dom/Element.h b/third_party/WebKit/Source/core/dom/Element.h
index 1f21fcaf2f4483149f863d350b5fef51daa3857b..2c4aaf3d9e6c1e204c3085b5e6f04784d8564fc4 100644
--- a/third_party/WebKit/Source/core/dom/Element.h
+++ b/third_party/WebKit/Source/core/dom/Element.h
@@ -649,6 +649,11 @@ private:
     PropertySetCSSStyleDeclaration* inlineStyleCSSOMWrapper();
     void setInlineStyleFromString(const AtomicString&);
 
+    // Returns whether the only inherited changes in the parent element are
+    // independent, and hence these changes can be directly propagated to this
+    // element (the child).
+    bool canPropagateInheritedProperties(StyleRecalcChange);
+
     StyleRecalcChange recalcOwnStyle(StyleRecalcChange);
     // TODO(nainar): Make this const ComputedStyle&.
     StyleRecalcChange buildOwnLayout(ComputedStyle&);