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 808e7f7bf05c25acb0d370f378984e7f2b3a2772..85d7605910c7d8d9a7a483ea5759a63b15ef0a0e 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;
@@ -102,6 +103,8 @@ public:
 
     void setWindowFeatures(const WindowFeatures&);
 
+    virtual void didOverscroll(const FloatSize&, const FloatSize&, const FloatPoint&, const FloatSize&) = 0;
+
     virtual void setToolbarsVisible(bool) = 0;
     virtual bool toolbarsVisible() = 0;