Wire input events through the ViewManagerClient interface.

mojo/examples/aura_demo/aura_demo.cc

Index: mojo/examples/aura_demo/aura_demo.cc
diff --git a/mojo/examples/aura_demo/aura_demo.cc b/mojo/examples/aura_demo/aura_demo.cc
index 4ef29030df04532f127dff0fd5a93d553286b977..d11463e07e56af9b4ce752060695d32834cde59a 100644
--- a/mojo/examples/aura_demo/aura_demo.cc
+++ b/mojo/examples/aura_demo/aura_demo.cc
@@ -143,6 +143,10 @@ class IViewManagerClientImpl
   }
   virtual void OnViewDeleted(uint32_t view) OVERRIDE {
   }
+  virtual void OnViewInputEvent(uint32_t view_id,
+                                EventPtr event,
+                                const Callback<void()>& callback) OVERRIDE {
+  }
 
   AuraDemo* aura_demo_;