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

content/browser/power_save_blocker_chromeos.cc

-// Copyright (c) 2012 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 "content/browser/power_save_blocker_impl.h"
-
-#include <string>
-
-#include "base/bind.h"
-#include "base/location.h"
-#include "base/logging.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "chromeos/dbus/power_policy_controller.h"
-
-namespace content {
-
-namespace {
-
-// Converts a PowerSaveBlocker::Reason to a
-// chromeos::PowerPolicyController::WakeLockReason.
-chromeos::PowerPolicyController::WakeLockReason GetWakeLockReason(
-    PowerSaveBlocker::Reason reason) {
-  switch (reason) {
-    case PowerSaveBlocker::kReasonAudioPlayback:
-      return chromeos::PowerPolicyController::REASON_AUDIO_PLAYBACK;
-    case PowerSaveBlocker::kReasonVideoPlayback:
-      return chromeos::PowerPolicyController::REASON_VIDEO_PLAYBACK;
-    case PowerSaveBlocker::kReasonOther:
-      return chromeos::PowerPolicyController::REASON_OTHER;
-  }
-  return chromeos::PowerPolicyController::REASON_OTHER;
-}
-
-}  // namespace
-
-class PowerSaveBlockerImpl::Delegate
-    : public base::RefCountedThreadSafe<PowerSaveBlockerImpl::Delegate> {
- public:
-  Delegate(PowerSaveBlockerType type,
-           Reason reason,
-           const std::string& description,
-           scoped_refptr<base::SequencedTaskRunner> ui_task_runner)
-      : type_(type),
-        reason_(reason),
-        description_(description),
-        block_id_(0),
-        ui_task_runner_(ui_task_runner) {}
-
-  void ApplyBlock() {
-    DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
-    if (!chromeos::PowerPolicyController::IsInitialized())
-      return;
-
-    auto* controller = chromeos::PowerPolicyController::Get();
-    switch (type_) {
-      case kPowerSaveBlockPreventAppSuspension:
-        block_id_ = controller->AddSystemWakeLock(GetWakeLockReason(reason_),
-                                                  description_);
-        break;
-      case kPowerSaveBlockPreventDisplaySleep:
-        block_id_ = controller->AddScreenWakeLock(GetWakeLockReason(reason_),
-                                                  description_);
-        break;
-      default:
-        NOTREACHED() << "Unhandled block type " << type_;
-    }
-  }
-
-  void RemoveBlock() {
-    DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
-    if (!chromeos::PowerPolicyController::IsInitialized())
-      return;
-
-    chromeos::PowerPolicyController::Get()->RemoveWakeLock(block_id_);
-  }
-
- private:
-  friend class base::RefCountedThreadSafe<Delegate>;
-  virtual ~Delegate() {}
-
-  PowerSaveBlockerType type_;
-  Reason reason_;
-  std::string description_;
-
-  // ID corresponding to the block request in PowerPolicyController.
-  int block_id_;
-
-  scoped_refptr<base::SequencedTaskRunner> ui_task_runner_;
-
-  DISALLOW_COPY_AND_ASSIGN(Delegate);
-};
-
-PowerSaveBlockerImpl::PowerSaveBlockerImpl(
-    PowerSaveBlockerType type,
-    Reason reason,
-    const std::string& description,
-    scoped_refptr<base::SequencedTaskRunner> ui_task_runner,
-    scoped_refptr<base::SingleThreadTaskRunner> blocking_task_runner)
-    : delegate_(new Delegate(type, reason, description, ui_task_runner)),
-      ui_task_runner_(ui_task_runner),
-      blocking_task_runner_(blocking_task_runner) {
-  ui_task_runner_->PostTask(FROM_HERE,
-                            base::Bind(&Delegate::ApplyBlock, delegate_));
-}
-
-PowerSaveBlockerImpl::~PowerSaveBlockerImpl() {
-  ui_task_runner_->PostTask(FROM_HERE,
-                            base::Bind(&Delegate::RemoveBlock, delegate_));
-}
-
-}  // namespace content