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

public/web/WebRemoteFrame.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebRemoteFrame_h
 #define WebRemoteFrame_h
 
 #include "public/web/WebFrame.h"
 #include "public/web/WebSandboxFlags.h"
 
 namespace blink {
 
+enum class WebTreeScopeType;
 class WebFrameClient;
 class WebRemoteFrameClient;
 
 class WebRemoteFrame : public WebFrame {
 public:
     BLINK_EXPORT static WebRemoteFrame* create(WebRemoteFrameClient*);
+    BLINK_EXPORT static WebRemoteFrame* create(WebTreeScopeType, WebRemoteFrameClient*);
 
+    // Functions for the embedder replicate the frame tree between processes.
+    // TODO(dcheng): The embedder currently does not replicate local frames in
+    // insertion order, so the local child version takes a previous sibling to
+    // ensure that it is inserted into the correct location in the list of
+    // children.
+    virtual WebLocalFrame* createLocalChild(WebTreeScopeType, const WebString& name, WebSandboxFlags, WebFrameClient*, WebFrame* previousSibling) = 0;
     virtual WebLocalFrame* createLocalChild(const WebString& name, WebSandboxFlags, WebFrameClient*, WebFrame* previousSibling) = 0;
 
+    virtual WebRemoteFrame* createRemoteChild(WebTreeScopeType, const WebString& name, WebSandboxFlags, WebRemoteFrameClient*) = 0;
     virtual WebRemoteFrame* createRemoteChild(const WebString& name, WebSandboxFlags, WebRemoteFrameClient*) = 0;
 
     // Transfer initial drawing parameters from a local frame.
     virtual void initializeFromFrame(WebLocalFrame*) const = 0;
 
     // Set security origin replicated from another process.
     virtual void setReplicatedOrigin(const WebSecurityOrigin&) const = 0;
 
     // Set sandbox flags replicated from another process.
     virtual void setReplicatedSandboxFlags(WebSandboxFlags) const = 0;
 
     // Set frame name replicated from another process.
     virtual void setReplicatedName(const WebString&) const = 0;
 
     virtual void DispatchLoadEventForFrameOwner() const = 0;
 
     virtual void didStartLoading() = 0;
     virtual void didStopLoading() = 0;
+
+protected:
+    explicit WebRemoteFrame(WebTreeScopeType scope) : WebFrame(scope) { }
 };
 
 } // namespace blink
 
 #endif // WebRemoteFrame_h