renderer_freezer.h revision 6e8cce623b6e4fe0c9e4af605d675dd9d0338c38 
1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CHROME_BROWSER_CHROMEOS_POWER_RENDERER_FREEZER_H_
6#define CHROME_BROWSER_CHROMEOS_POWER_RENDERER_FREEZER_H_
7
8#include "base/files/file_path.h"
9#include "base/time/time.h"
10#include "chromeos/chromeos_export.h"
11#include "chromeos/dbus/power_manager_client.h"
12
13namespace chromeos {
14
15// Freezes the chrome renderers when the system is about to suspend and thaws
16// them after the system fully resumes.  This class registers itself as a
17// PowerManagerClient::Observer on creation and unregisters itself on
18// destruction.
19class CHROMEOS_EXPORT RendererFreezer : public PowerManagerClient::Observer {
20 public:
21  RendererFreezer();
22  virtual ~RendererFreezer();
23
24  // PowerManagerClient::Observer implementation
25  virtual void SuspendImminent() OVERRIDE;
26  virtual void SuspendDone(const base::TimeDelta& sleep_duration) OVERRIDE;
27
28 private:
29  base::FilePath state_path_;
30  bool enabled_;
31  bool frozen_;
32
33  DISALLOW_COPY_AND_ASSIGN(RendererFreezer);
34};
35
36}  // namespace chromeos
37
38#endif  // CHROME_BROWSER_CHROMEOS_POWER_RENDERER_FREEZER_H_
39