ResizeObserver pt5: size change notification

third_party/WebKit/Source/core/observer/ResizeObservation.h

Index: third_party/WebKit/Source/core/observer/ResizeObservation.h
diff --git a/third_party/WebKit/Source/core/observer/ResizeObservation.h b/third_party/WebKit/Source/core/observer/ResizeObservation.h
index 18b6f0ef3a45ad2aa5fae9a3121f5758c2f7096c..29ec1a13c4165d7c9ba9da3f4b65467fbc94c525 100644
--- a/third_party/WebKit/Source/core/observer/ResizeObservation.h
+++ b/third_party/WebKit/Source/core/observer/ResizeObservation.h
@@ -24,6 +24,7 @@ public:
     void setObservationSize(const LayoutSize&);
     // True if observationSize differs from target's current size.
     bool observationSizeOutOfSync() const;
+    void elementSizeChanged();
 
     static LayoutSize getTargetSize(Element* target);
 
@@ -34,6 +35,7 @@ private:
     Member<ResizeObserver> m_observer;
     // Target size sent in last observation notification.
     LayoutSize m_observationSize;
+    bool m_elementSizeChanged;
 };
 
 } // namespace blink