Update WindowTree::OnWindowInputEventAck to include handled

content/renderer/mus/compositor_mus_connection.h

Index: content/renderer/mus/compositor_mus_connection.h
diff --git a/content/renderer/mus/compositor_mus_connection.h b/content/renderer/mus/compositor_mus_connection.h
index 7b0f69611b6f18388cab81dd709328342bdf3d22..a2c377eb81c16ba81298bb07f7c47b6759503cc3 100644
--- a/content/renderer/mus/compositor_mus_connection.h
+++ b/content/renderer/mus/compositor_mus_connection.h
@@ -42,6 +42,7 @@ class CompositorMusConnection
       scoped_ptr<mus::WindowSurfaceBinding> surface_binding);
 
  private:
+  friend class CompositorMusConnectionTest;
   friend class base::RefCountedThreadSafe<CompositorMusConnection>;
 
   ~CompositorMusConnection() override;
@@ -56,18 +57,20 @@ class CompositorMusConnection
 
   void OnWindowInputEventOnMainThread(
       scoped_ptr<blink::WebInputEvent> web_event,
-      const base::Closure& ack);
+      const base::Callback<void(bool)>& ack);
 
-  void OnWindowInputEventAckOnMainThread(const base::Closure& ack);
+  void OnWindowInputEventAckOnMainThread(const base::Callback<void(bool)>& ack,
+                                         bool handled);
 
   // WindowTreeDelegate implementation:
   void OnConnectionLost(mus::WindowTreeConnection* connection) override;
   void OnEmbed(mus::Window* root) override;
 
   // InputEventHandler implementation:
-  void OnWindowInputEvent(mus::Window* window,
-                          mus::mojom::EventPtr event,
-                          scoped_ptr<base::Closure>* ack_callback) override;
+  void OnWindowInputEvent(
+      mus::Window* window,
+      mus::mojom::EventPtr event,
+      scoped_ptr<base::Callback<void(bool)>>* ack_callback) override;
 
   const int routing_id_;
   mus::Window* root_;