DevTools: [CSS] getMatchedStylesForNode should return styles inherited through shadow boundary

Source/core/inspector/InspectorCSSAgent.cpp

Index: Source/core/inspector/InspectorCSSAgent.cpp
diff --git a/Source/core/inspector/InspectorCSSAgent.cpp b/Source/core/inspector/InspectorCSSAgent.cpp
index 49d2abbf667634119a532fb1f7ca5ac81fdcc40c..46ad434f23c3c9a0a480b6895ed7343b2ac16042 100644
--- a/Source/core/inspector/InspectorCSSAgent.cpp
+++ b/Source/core/inspector/InspectorCSSAgent.cpp
@@ -774,7 +774,7 @@ void InspectorCSSAgent::getMatchedStylesForNode(ErrorString* errorString, int no
     // Inherited styles.
     if (!elementPseudoId && !asBool(excludeInherited)) {
         RefPtr<TypeBuilder::Array<TypeBuilder::CSS::InheritedStyleEntry> > entries = TypeBuilder::Array<TypeBuilder::CSS::InheritedStyleEntry>::create();
-        Element* parentElement = element->parentElement();
+        Element* parentElement = element->parentOrShadowHostElement();
         while (parentElement) {
             StyleResolver& parentStyleResolver = parentElement->ownerDocument()->ensureStyleResolver();
             RefPtrWillBeRawPtr<CSSRuleList> parentMatchedRules = parentStyleResolver.cssRulesForElement(parentElement, StyleResolver::AllCSSRules);
@@ -787,7 +787,7 @@ void InspectorCSSAgent::getMatchedStylesForNode(ErrorString* errorString, int no
             }
 
             entries->addItem(entry.release());
-            parentElement = parentElement->parentElement();
+            parentElement = parentElement->parentOrShadowHostElement();
         }
 
         inheritedEntries = entries.release();