mash: Convert OnWindowInputEventAck to use an enum for handled status

components/mus/ws/window_manager_state.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_MUS_WS_WINDOW_MANAGER_STATE_H_
 #define COMPONENTS_MUS_WS_WINDOW_MANAGER_STATE_H_
 
 #include <stdint.h>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 78 matching lines @@
   // not be exposed.
   EventDispatcher* event_dispatcher() { return &event_dispatcher_; }
 
   void Activate(const gfx::Point& mouse_location_on_screen);
   void Deactivate();
 
   // Processes an event from PlatformDisplay.
   void ProcessEvent(const ui::Event& event);
 
   // Called when the ack from an event dispatched to WindowTree |tree| is
-  // received. When |handled| is true, the client consumed the event.
+  // received.
   // TODO(sky): make this private and use a callback.
-  void OnEventAck(mojom::WindowTree* tree, bool handled);
+  void OnEventAck(mojom::WindowTree* tree, mojom::EventResult result);
 
   // Returns a mojom::Display for the specified display. WindowManager specific
   // values are not set.
   mojom::DisplayPtr ToMojomDisplay() const;
 
   void OnWillDestroyTree(WindowTree* tree);
 
  private:
   class ProcessedEventTarget;
   friend class Display;
@@ skipping 76 matching lines @@
 
   EventDispatcher event_dispatcher_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowManagerState);
 };
 
 }  // namespace ws
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_WINDOW_MANAGER_STATE_H_