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

Source/core/inspector/InspectorOverlayHost.h

Index: Source/core/inspector/InspectorOverlayHost.h
diff --git a/Source/core/inspector/InspectorOverlayHost.h b/Source/core/inspector/InspectorOverlayHost.h
index 58c61b4beef28164d3fa5fc6365e2f88e3198b9e..c0a97f73a09ea81dddeb532a2a4dde8c952a7525 100644
--- a/Source/core/inspector/InspectorOverlayHost.h
+++ b/Source/core/inspector/InspectorOverlayHost.h
@@ -48,19 +48,33 @@ public:
 
     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