Reland of 'Move content/browser/power_save_blocker to //device/power_save_blocker'

content/browser/power_save_blocker_impl.h

-// Copyright (c) 2013 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 CONTENT_BROWSER_POWER_SAVE_BLOCKER_IMPL_H_
-#define CONTENT_BROWSER_POWER_SAVE_BLOCKER_IMPL_H_
-
-#include <string>
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/weak_ptr.h"
-#include "base/sequenced_task_runner.h"
-#include "base/single_thread_task_runner.h"
-#include "build/build_config.h"
-#include "content/public/browser/power_save_blocker.h"
-
-#if defined(OS_ANDROID)
-#include "ui/android/view_android.h"
-#endif  // OS_ANDROID
-
-namespace content {
-
-class WebContents;
-
-class PowerSaveBlockerImpl : public PowerSaveBlocker {
- public:
-  PowerSaveBlockerImpl(
-      PowerSaveBlockerType type,
-      Reason reason,
-      const std::string& description,
-      scoped_refptr<base::SequencedTaskRunner> ui_task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> blocking_task_runner);
-  ~PowerSaveBlockerImpl() override;
-
-#if defined(OS_ANDROID)
-  // On Android, the kPowerSaveBlockPreventDisplaySleep type of
-  // PowerSaveBlocker should associated with a View, so the blocker can be
-  // removed by the platform.
-  void InitDisplaySleepBlocker(
-      const base::WeakPtr<ui::ViewAndroid>& view_android);
-#endif
-
- private:
-  class Delegate;
-
-  // Implementations of this class may need a second object with different
-  // lifetime than the RAII container, or additional storage. This member is
-  // here for that purpose. If not used, just define the class as an empty
-  // RefCounted (or RefCountedThreadSafe) like so to make it compile:
-  // class PowerSaveBlocker::Delegate
-  //     : public base::RefCounted<PowerSaveBlocker::Delegate> {
-  //  private:
-  //   friend class base::RefCounted<Delegate>;
-  //   ~Delegate() {}
-  // };
-  scoped_refptr<Delegate> delegate_;
-
-#if defined(USE_X11)
-  // Since display sleep prevention also implies system suspend prevention, for
-  // the Linux FreeDesktop API case, there needs to be a second delegate to
-  // block system suspend when screen saver / display sleep is blocked.
-  scoped_refptr<Delegate> freedesktop_suspend_delegate_;
-#endif
-
-  scoped_refptr<base::SequencedTaskRunner> ui_task_runner_;
-  scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
-
-  DISALLOW_COPY_AND_ASSIGN(PowerSaveBlockerImpl);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_POWER_SAVE_BLOCKER_IMPL_H_