OverscrollGlow for mainThread-{BLINK CHANGES}

Source/core/loader/EmptyClients.h

Index: Source/core/loader/EmptyClients.h
diff --git a/Source/core/loader/EmptyClients.h b/Source/core/loader/EmptyClients.h
index 9cf5195043a9ea355cf5c792c843b1453314b990..390533e2f86253aaa0a391b603e6b22eddba084c 100644
--- a/Source/core/loader/EmptyClients.h
+++ b/Source/core/loader/EmptyClients.h
@@ -39,6 +39,7 @@
 #include "core/page/Page.h"
 #include "core/page/SpellCheckerClient.h"
 #include "platform/DragImage.h"
+#include "platform/geometry/FloatPoint.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/heap/Handle.h"
 #include "platform/network/ResourceError.h"
@@ -85,6 +86,8 @@ public:
     virtual Page* createWindow(LocalFrame*, const FrameLoadRequest&, const WindowFeatures&, NavigationPolicy, ShouldSendReferrer) override { return 0; }
     virtual void show(NavigationPolicy) override { }
 
+    virtual void didOverscroll(FloatSize&, FloatSize&, FloatPoint&, FloatSize&) override { }
+
     virtual void setToolbarsVisible(bool) override { }
     virtual bool toolbarsVisible() override { return false; }