Change AckEvent into request / response

mojo/examples/pepper_container_app/pepper_container_app.cc

Index: mojo/examples/pepper_container_app/pepper_container_app.cc
diff --git a/mojo/examples/pepper_container_app/pepper_container_app.cc b/mojo/examples/pepper_container_app/pepper_container_app.cc
index ec45a45c96b6ba9ad4aa0d409d501df740481966..992ffdc6123dd538d9f20a6f6452031b3f07426d 100644
--- a/mojo/examples/pepper_container_app/pepper_container_app.cc
+++ b/mojo/examples/pepper_container_app/pepper_container_app.cc
@@ -90,7 +90,8 @@ class PepperContainerApp: public Application,
       plugin_instance_->DidChangeView(bounds);
   }
 
-  virtual void OnEvent(const Event& event) OVERRIDE {
+  virtual void OnEvent(const Event& event,
+                       const mojo::Callback<void()>& callback) OVERRIDE {
     if (event.location().is_null())

[darin (slow to review), 2014/03/31 03:24:05]

it might be good to leave a comment here checking if it makes sense to suppress
the callback in this case. the caller of OnEvent will be left hanging if we
return early here. is that ok?

       return;
 
@@ -99,7 +100,7 @@ class PepperContainerApp: public Application,
 
       // TODO(yzshen): Handle events.
     }
-    viewport_->AckEvent(event);
+    callback.Run();
   }
 
   // MojoPpapiGlobals::Delegate implementation.