Devtools[LayoutEditor]: Pass data about property change from InspectorOverlayPage

Source/core/inspector/InspectorOverlayHost.h

 /*
  * Copyright (C) 2013 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 30 matching lines @@
 public:
     static PassRefPtrWillBeRawPtr<InspectorOverlayHost> create()
     {
         return adoptRefWillBeNoop(new InspectorOverlayHost());
     }
     ~InspectorOverlayHost();
     DECLARE_TRACE();
 
     void resume();
     void stepOver();
+    void startPropertyChange(const String&);
+    void changeProperty(float delta);
+    void endPropertyChange();
 
-    class Listener : public WillBeGarbageCollectedMixin {
+    class DebuggerListener : public WillBeGarbageCollectedMixin {
     public:
-        virtual ~Listener() { }
+        virtual ~DebuggerListener() { }
         virtual void overlayResumed() = 0;
         virtual void overlaySteppedOver() = 0;
     };
-    void setListener(Listener* listener) { m_listener = listener; }
+    void setDebuggerListener(DebuggerListener* listener) { m_debuggerListener = listener; }
+
+    class LayoutEditorListener : public WillBeGarbageCollectedMixin {
+    public:
+        virtual ~LayoutEditorListener() { }
+        virtual void overlayStartedPropertyChange(const String&) = 0;
+        virtual void overlayPropertyChanged(float cssDelta) = 0;
+        virtual void overlayEndedPropertyChange() = 0;
+    };
+    void setLayoutEditorListener(LayoutEditorListener* listener) { m_layoutEditorListener = listener; }
 
 private:
     InspectorOverlayHost();
 
-    RawPtrWillBeMember<Listener> m_listener;
+    RawPtrWillBeMember<DebuggerListener> m_debuggerListener;
+    RawPtrWillBeMember<LayoutEditorListener> m_layoutEditorListener;
+
 };
 
 } // namespace blink
 
 #endif // InspectorOverlayHost_h