Wire input events through the ViewManagerClient interface.

mojo/services/public/cpp/view_manager/lib/view_manager_synchronizer.h

Index: mojo/services/public/cpp/view_manager/lib/view_manager_synchronizer.h
diff --git a/mojo/services/public/cpp/view_manager/lib/view_manager_synchronizer.h b/mojo/services/public/cpp/view_manager/lib/view_manager_synchronizer.h
index 73a75ae7a7e5b88d48a375391040312d33d9b5b4..8b3f85c6d57acc35c8255a31c25d8cd36fd23007 100644
--- a/mojo/services/public/cpp/view_manager/lib/view_manager_synchronizer.h
+++ b/mojo/services/public/cpp/view_manager/lib/view_manager_synchronizer.h
@@ -87,6 +87,9 @@ class ViewManagerSynchronizer : public IViewManagerClient {
                                   uint32_t new_view_id,
                                   uint32_t old_view_id) OVERRIDE;
   virtual void OnViewDeleted(uint32_t view_id) OVERRIDE;
+  virtual void OnViewInputEvent(uint32_t view,
+                                const Event& event,
+                                const Callback<void()>& callback) OVERRIDE;
 
   // Sync the client model with the service by enumerating the pending
   // transaction queue and applying them in order.