Add chrome.power extension API.

chrome/browser/chromeos/extensions/power/power_api_manager.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 "chrome/browser/chromeos/extensions/power/power_api_manager.h"
-
-#include "chrome/common/chrome_notification_types.h"
-#include "chrome/common/extensions/extension.h"
-#include "chromeos/power/power_state_override.h"
-#include "content/public/browser/notification_service.h"
-
-namespace extensions {
-namespace power {
-
-// static
-PowerApiManager* PowerApiManager::GetInstance() {
-  return Singleton<PowerApiManager>::get();
-}
-
-void PowerApiManager::AddExtensionLock(const std::string& extension_id) {
-  extension_ids_set_.insert(extension_id);
-  UpdatePowerSettings();
-}
-
-void PowerApiManager::RemoveExtensionLock(const std::string& extension_id) {
-  extension_ids_set_.erase(extension_id);
-  UpdatePowerSettings();
-}
-
-void PowerApiManager::Observe(int type,
-                              const content::NotificationSource& source,
-                              const content::NotificationDetails& details) {
-  if (type == chrome::NOTIFICATION_EXTENSION_UNLOADED) {
-    RemoveExtensionLock(
-        content::Details<extensions::UnloadedExtensionInfo>(details)->
-            extension->id());
-    UpdatePowerSettings();
-  } else if (type == chrome::NOTIFICATION_APP_TERMINATING) {
-    // If the Chrome app is terminating, ensure we release our power overrides.
-    power_state_override_ = NULL;
-  } else {
-    NOTREACHED() << "Unexpected notification " << type;
-  }
-}
-
-PowerApiManager::PowerApiManager()
-    : power_state_override_(NULL) {
-  registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNLOADED,
-                  content::NotificationService::AllSources());
-  registrar_.Add(this, chrome::NOTIFICATION_APP_TERMINATING,
-                 content::NotificationService::AllSources());
-  UpdatePowerSettings();
-}
-
-PowerApiManager::~PowerApiManager() {}
-
-void PowerApiManager::UpdatePowerSettings() {
-  // If we have a wake lock and don't have the power state overriden.
-  if (extension_ids_set_.size() && !power_state_override_.get()) {
-    power_state_override_ = new chromeos::PowerStateOverride(
-        chromeos::PowerStateOverride::BLOCK_DISPLAY_SLEEP);
-  // else, if we don't have any wake locks and do have a power override.
-  } else if (extension_ids_set_.empty() && power_state_override_.get()) {
-    power_state_override_ = NULL;
-  }
-}
-
-}  // namespace power
-}  // namespace extensions