DevTools: Allow general editing of author shadow DOM elements

Source/core/inspector/InspectorDOMAgent.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 450 matching lines @@
 
     return node;
 }
 
 Element* InspectorDOMAgent::assertEditableElement(ErrorString* errorString, int nodeId)
 {
     Element* element = assertElement(errorString, nodeId);
     if (!element)
         return 0;
 
-    if (element->isInShadowTree()) {
-        *errorString = "Cannot edit elements from shadow trees";
+    if (element->isInShadowTree() && userAgentShadowRoot(element)) {
+        *errorString = "Cannot edit elements from user-agent shadow trees";
         return 0;
     }
 
     if (element->isPseudoElement()) {
         *errorString = "Cannot edit pseudo elements";
         return 0;
     }
 
     return element;
 }
@@ skipping 1614 matching lines @@
     if (!m_documentNodeToIdMap.contains(m_document)) {
         RefPtr<TypeBuilder::DOM::Node> root;
         getDocument(errorString, root);
         return errorString->isEmpty();
     }
     return true;
 }
 
 } // namespace WebCore