OverscrollGlow for mainThread-{BLINK CHANGES}

Source/core/page/ChromeClient.h

Index: Source/core/page/ChromeClient.h
diff --git a/Source/core/page/ChromeClient.h b/Source/core/page/ChromeClient.h
index a45c64247e96e1fd0026834ead3859bcc54222ab..d5a77bd967ef452a0d4a0c283d6672262f6adb3c 100644
--- a/Source/core/page/ChromeClient.h
+++ b/Source/core/page/ChromeClient.h
@@ -50,6 +50,7 @@ class DateTimeChooserClient;
 class Element;
 class FileChooser;
 class Frame;
+class FloatPoint;
 class GraphicsContext;
 class GraphicsLayer;
 class GraphicsLayerFactory;
@@ -98,6 +99,9 @@ public:
     virtual Page* createWindow(LocalFrame*, const FrameLoadRequest&, const WindowFeatures&, NavigationPolicy, ShouldSendReferrer) = 0;
     virtual void show(NavigationPolicy) = 0;
 
+    // Pass on values for overscroll glow animation on main thread.
+    virtual void didOverscroll(const FloatSize&, const FloatSize&, const FloatPoint&, const FloatSize&) = 0;
+
     virtual void setToolbarsVisible(bool) = 0;
     virtual bool toolbarsVisible() = 0;