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

Source/web/WebLocalFrameImpl.h

 /*
  * Copyright (C) 2009 Google 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 230 matching lines @@
     virtual void addStyleSheetByURL(const WebString& url) override;
     virtual void navigateToSandboxedMarkup(const WebData& markup) override;
     virtual void sendOrientationChangeEvent() override;
     virtual void willShowInstallBannerPrompt(int requestId, const WebVector<WebString>& platforms, WebAppBannerPromptReply*) override;
     virtual void willShowInstallBannerPrompt(const WebVector<WebString>& platforms, WebAppBannerPromptReply*) override;
     void requestRunTask(WebSuspendableTask*) const override;
 
     void willBeDetached();
     void willDetachParent();
 
-    static WebLocalFrameImpl* create(WebFrameClient*);
+    static WebLocalFrameImpl* create(WebTreeScopeType, WebFrameClient*);
     virtual ~WebLocalFrameImpl();
 
     PassRefPtrWillBeRawPtr<LocalFrame> initializeCoreFrame(FrameHost*, FrameOwner*, const AtomicString& name, const AtomicString& fallbackName);
 
     PassRefPtrWillBeRawPtr<LocalFrame> createChildFrame(const FrameLoadRequest&, const AtomicString& name, HTMLFrameOwnerElement*);
 
     void didChangeContentsSize(const IntSize&);
 
     void createFrameView();
 
@@ skipping 71 matching lines @@
     void setDevToolsFrontend(WebDevToolsFrontendImpl* frontend) { m_webDevToolsFrontend = frontend; }
     WebDevToolsFrontendImpl* devToolsFrontend() { return m_webDevToolsFrontend; }
 
 #if ENABLE(OILPAN)
     DECLARE_TRACE();
 #endif
 
 private:
     friend class FrameLoaderClientImpl;
 
-    explicit WebLocalFrameImpl(WebFrameClient*);
+    WebLocalFrameImpl(WebTreeScopeType, WebFrameClient*);
 
     // Sets the local core frame and registers destruction observers.
     void setCoreFrame(PassRefPtrWillBeRawPtr<LocalFrame>);
 
     void loadJavaScriptURL(const KURL&);
 
     WebPlugin* focusedPluginIfInputMethodSupported();
 
     FrameLoaderClientImpl m_frameLoaderClientImpl;
 
@@ skipping 40 matching lines @@
     GC_PLUGIN_IGNORE("340522")
     Persistent<WebLocalFrameImpl> m_selfKeepAlive;
 #endif
 };
 
 DEFINE_TYPE_CASTS(WebLocalFrameImpl, WebFrame, frame, frame->isWebLocalFrame(), frame.isWebLocalFrame());
 
 } // namespace blink
 
 #endif