Reland: Remove aura and make a pure mojo::View version of FocusController.

mojo/services/window_manager/native_viewport_event_dispatcher_impl.h

 // 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.
 
 #ifndef MOJO_SERVICES_WINDOW_MANAGER_NATIVE_VIEWPORT_EVENT_DISPATCHER_IMPL_H_
 #define MOJO_SERVICES_WINDOW_MANAGER_NATIVE_VIEWPORT_EVENT_DISPATCHER_IMPL_H_
 
 #include "base/basictypes.h"
 #include "mojo/services/public/interfaces/native_viewport/native_viewport.mojom.h"
+#include "ui/events/event_source.h"
 
 namespace mojo {
 
 class WindowManagerApp;
 
 class NativeViewportEventDispatcherImpl
-    : public InterfaceImpl<NativeViewportEventDispatcher> {
+    : public ui::EventSource,
+      public InterfaceImpl<NativeViewportEventDispatcher> {
  public:
   explicit NativeViewportEventDispatcherImpl(WindowManagerApp* app);
   ~NativeViewportEventDispatcherImpl() override;
 
  private:
+  // ui::EventSource:
+  ui::EventProcessor* GetEventProcessor() override;
+
   // NativeViewportEventDispatcher:
   void OnEvent(mojo::EventPtr event,
                const mojo::Callback<void()>& callback) override;
 
   WindowManagerApp* app_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeViewportEventDispatcherImpl);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_WINDOW_MANAGER_NATIVE_VIEWPORT_EVENT_DISPATCHER_IMPL_H_