Hook ScrollElasticityController to InputHandlerProxy

content/renderer/input/input_handler_proxy_unittest.cc

Index: content/renderer/input/input_handler_proxy_unittest.cc
diff --git a/content/renderer/input/input_handler_proxy_unittest.cc b/content/renderer/input/input_handler_proxy_unittest.cc
index 4de546901aa13db2dc99e4e882fa622825456c36..aafe9187371cceb5f7ce7f84c8fe6ede3342792c 100644
--- a/content/renderer/input/input_handler_proxy_unittest.cc
+++ b/content/renderer/input/input_handler_proxy_unittest.cc
@@ -104,6 +104,10 @@ class MockInputHandler : public cc::InputHandler {
       return scoped_ptr<cc::SwapPromiseMonitor>();
   }
 
+  cc::ScrollElasticityHelper* CreateScrollElasticityHelper() override {
+    return NULL;
+  }
+
   virtual void BindToClient(cc::InputHandlerClient* client) override {}
 
   virtual void MouseMoveAt(const gfx::Point& mouse_position) override {}