Refactors event dispatching of NativeViewport into its own interface

mojo/services/view_manager/display_manager.cc

 // Copyright 2014 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.
 
 #include "mojo/services/view_manager/display_manager.h"
 
 #include "base/numerics/safe_conversions.h"
 #include "cc/surfaces/surface_id_allocator.h"
 #include "mojo/converters/geometry/geometry_type_converters.h"
 #include "mojo/converters/surfaces/surfaces_type_converters.h"
@@ skipping 70 matching lines @@
                                    &native_viewport_);
   native_viewport_.set_client(this);
   native_viewport_->Create(
       Size::From(size_),
       base::Bind(&DisplayManager::OnCreatedNativeViewport,
                  weak_factory_.GetWeakPtr()));
   native_viewport_->Show();
   app_connection->ConnectToService("mojo:surfaces_service", &surfaces_service_);
   surfaces_service_->CreateSurfaceConnection(base::Bind(
       &DisplayManager::OnSurfaceConnectionCreated, weak_factory_.GetWeakPtr()));
+
+  NativeViewportEventDispatcherPtr event_dispatcher;
+  app_connection->ConnectToService(&event_dispatcher);
+  native_viewport_->SetEventDispatcher(event_dispatcher.Pass());
 }
 
 DisplayManager::~DisplayManager() {
 }
 
 void DisplayManager::SchedulePaint(const ServerView* view,
                                    const gfx::Rect& bounds) {
   if (!view->visible())
     return;
   gfx::Rect root_relative_rect = ConvertRectToRoot(view, bounds);
@@ skipping 49 matching lines @@
 void DisplayManager::OnSizeChanged(SizePtr size) {
   size_ = size.To<gfx::Size>();
   connection_manager_->root()->SetBounds(gfx::Rect(size_));
   if (surface_id_.is_null())
     return;
   surface_->DestroySurface(SurfaceId::From(surface_id_));
   surface_id_ = cc::SurfaceId();
   SchedulePaint(connection_manager_->root(), gfx::Rect(size_));
 }
 
-void DisplayManager::OnEvent(EventPtr event,
-                             const mojo::Callback<void()>& callback) {
-  connection_manager_->DispatchViewInputEventToDelegate(event.Pass());
-  callback.Run();
-}
-
 void DisplayManager::ReturnResources(Array<ReturnedResourcePtr> resources) {
   DCHECK_EQ(0u, resources.size());
 }
 
 }  // namespace service
 }  // namespace mojo