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

public/web/WebFrame.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 24 matching lines @@
 #include "WebHistoryItem.h"
 #include "WebIconURL.h"
 #include "WebNode.h"
 #include "WebURLLoaderOptions.h"
 #include "public/platform/WebCanvas.h"
 #include "public/platform/WebMessagePortChannel.h"
 #include "public/platform/WebPrivateOwnPtr.h"
 #include "public/platform/WebReferrerPolicy.h"
 #include "public/platform/WebURL.h"
 #include "public/platform/WebURLRequest.h"
+#include "public/web/WebTreeScopeType.h"
 
 struct NPObject;
 
 namespace v8 {
 class Context;
 class Function;
 class Object;
 class Value;
 template <class T> class Local;
 }
@@ skipping 615 matching lines @@
     // Only for testing purpose:
     // Returns true if selection.anchorNode has a marker on range from |from| with |length|.
     virtual bool selectionStartHasSpellingMarkerFor(int from, int length) const = 0;
 
     // Dumps the layer tree, used by the accelerated compositor, in
     // text form. This is used only by layout tests.
     virtual WebString layerTreeAsText(bool showDebugInfo = false) const = 0;
 
 #if BLINK_IMPLEMENTATION
     static WebFrame* fromFrame(Frame*);
+
+    bool inShadowTree() const { return m_scope == WebTreeScopeType::Shadow; }
+
 #if ENABLE(OILPAN)
     static void traceFrames(Visitor*, WebFrame*);
     static void traceFrames(InlinedGlobalMarkingVisitor, WebFrame*);
     void clearWeakFrames(Visitor*);
     void clearWeakFrames(InlinedGlobalMarkingVisitor);
 #endif
 #endif
 
 protected:
-    WebFrame();
+    explicit WebFrame(WebTreeScopeType);
     virtual ~WebFrame();
 
     // Sets the parent WITHOUT fulling adding it to the frame tree.
     // Used to lie to a local frame that is replacing a remote frame,
     // so it can properly start a navigation but wait to swap until
     // commit-time.
     void setParent(WebFrame*);
 
 private:
     friend class OpenedFrameTracker;
 
 #if BLINK_IMPLEMENTATION
 #if ENABLE(OILPAN)
     static void traceFrame(Visitor*, WebFrame*);
     static void traceFrame(InlinedGlobalMarkingVisitor, WebFrame*);
     static bool isFrameAlive(Visitor*, const WebFrame*);
     static bool isFrameAlive(InlinedGlobalMarkingVisitor, const WebFrame*);
 
     template <typename VisitorDispatcher>
     static void traceFramesImpl(VisitorDispatcher, WebFrame*);
     template <typename VisitorDispatcher>
     void clearWeakFramesImpl(VisitorDispatcher);
     template <typename VisitorDispatcher>
     static void traceFrameImpl(VisitorDispatcher, WebFrame*);
     template <typename VisitorDispatcher>
     static bool isFrameAliveImpl(VisitorDispatcher, const WebFrame*);
 #endif
 #endif
 
+    const WebTreeScopeType m_scope;
+
     WebFrame* m_parent;
     WebFrame* m_previousSibling;
     WebFrame* m_nextSibling;
     WebFrame* m_firstChild;
     WebFrame* m_lastChild;
 
     WebFrame* m_opener;
     WebPrivateOwnPtr<OpenedFrameTracker> m_openedFrameTracker;
 };
 
 #if BLINK_IMPLEMENTATION
 Frame* toCoreFrame(const WebFrame*);
 #endif
 
 } // namespace blink
 
 #endif