Intorduce PowerButtonObserver API

athena/input/input_manager_impl.h

Index: athena/input/input_manager_impl.h
diff --git a/athena/input/input_manager_impl.h b/athena/input/input_manager_impl.h
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index 0000000000000000000000000000000000000000..b2607a75889a283c134500e8039bbbf58e33d019
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+++ b/athena/input/input_manager_impl.h
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+// 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 ATHENA_INPUT_INPUT_MANAGER_IMPL_H_
+#define ATHENA_INPUT_INPUT_MANAGER_IMPL_H_
+
+#include "athena/input/public/input_manager.h"
+
+#include "athena/athena_export.h"
+#include "athena/input/accelerator_manager_impl.h"
+#include "ui/aura/client/event_client.h"
+#include "ui/events/event_target.h"
+
+namespace athena {
+class PowerButtonController;
+
+namespace test {
+class ScopedPowerButtonTimeoutShortener;
+}
+
+class ATHENA_EXPORT InputManagerImpl : public InputManager,
+                                       public ui::EventTarget,
+                                       public aura::client::EventClient {
+ public:
+  InputManagerImpl();
+  virtual ~InputManagerImpl();
+
+  void Init();
+  void Shutdown();
+
+ private:
+  friend class test::ScopedPowerButtonTimeoutShortener;
+
+  // InputManager:
+  virtual void OnRootWindowCreated(aura::Window* root_window) override;
+  virtual ui::EventTarget* GetTopmostEventTarget() override;
+  virtual AcceleratorManager* GetAcceleratorManager() override;
+  virtual void AddPowerButtonObserver(PowerButtonObserver* observer) override;
+  virtual void RemovePowerButtonObserver(
+      PowerButtonObserver* observer) override;
+
+  // Overridden from aura::client::EventClient:
+  virtual bool CanProcessEventsWithinSubtree(
+      const aura::Window* window) const override;
+  virtual ui::EventTarget* GetToplevelEventTarget() override;
+
+  // ui::EventTarget:
+  virtual bool CanAcceptEvent(const ui::Event& event) override;
+  virtual ui::EventTarget* GetParentTarget() override;
+  virtual scoped_ptr<ui::EventTargetIterator> GetChildIterator() const override;
+  virtual ui::EventTargeter* GetEventTargeter() override;
+  virtual void OnEvent(ui::Event* event) override;
+
+  int SetPowerButtonTimeoutMsForTest(int timeout);
+
+  scoped_ptr<AcceleratorManagerImpl> accelerator_manager_;
+  scoped_ptr<PowerButtonController> power_button_controller_;
+
+  DISALLOW_COPY_AND_ASSIGN(InputManagerImpl);
+};
+
+}  // namespace athena
+
+#endif  // ATHENA_INPUT_INPUT_MANAGER_IMPL_H_