Plumb whether or not a frame is in shadow DOM to the embedder.

Source/web/FrameLoaderClientImpl.cpp

 /*
  * Copyright (C) 2009, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 249 matching lines @@
     if (m_webFrame->contentSettingsClient())
         m_webFrame->contentSettingsClient()->didNotAllowPlugins();
 
 }
 
 bool FrameLoaderClientImpl::hasWebView() const
 {
     return m_webFrame->viewImpl();
 }
 
+bool FrameLoaderClientImpl::inShadowTree() const
+{
+    return m_webFrame->inShadowTree();
+}
+
 Frame* FrameLoaderClientImpl::opener() const
 {
     return toCoreFrame(m_webFrame->opener());
 }
 
 void FrameLoaderClientImpl::setOpener(Frame* opener)
 {
     m_webFrame->setOpener(WebFrame::fromFrame(opener));
 }
 
@@ skipping 686 matching lines @@
 
 void FrameLoaderClientImpl::suddenTerminationDisablerChanged(bool present, SuddenTerminationDisablerType type)
 {
     if (m_webFrame->client()) {
         m_webFrame->client()->suddenTerminationDisablerChanged(
             present, static_cast<WebFrameClient::SuddenTerminationDisablerType>(type));
     }
 }
 
 } // namespace blink