[CleanUp] Move PowerApiManager to power_api and Rename

extensions/browser/api/power/power_api.cc

 // 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.
 
 #include "extensions/browser/api/power/power_api.h"
 
-#include "extensions/browser/api/power/power_api_manager.h"
+#include "base/bind.h"
+#include "base/lazy_instance.h"
+#include "extensions/browser/extension_registry.h"
 #include "extensions/common/api/power.h"
+#include "extensions/common/extension.h"
 
 namespace extensions {
 
+namespace {
+
+const char kPowerSaveBlockerDescription[] = "extension";
+
+content::PowerSaveBlocker::PowerSaveBlockerType LevelToPowerSaveBlockerType(
+    core_api::power::Level level) {
+  switch (level) {
+    case core_api::power::LEVEL_SYSTEM:
+      return content::PowerSaveBlocker::kPowerSaveBlockPreventAppSuspension;
+    case core_api::power::LEVEL_DISPLAY:  // fallthrough
+    case core_api::power::LEVEL_NONE:
+      return content::PowerSaveBlocker::kPowerSaveBlockPreventDisplaySleep;
+  }
+  NOTREACHED() << "Unhandled level " << level;
+  return content::PowerSaveBlocker::kPowerSaveBlockPreventDisplaySleep;
+}
+
+base::LazyInstance<BrowserContextKeyedAPIFactory<PowerAPI>> g_factory =
+    LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
 bool PowerRequestKeepAwakeFunction::RunSync() {
   scoped_ptr<core_api::power::RequestKeepAwake::Params> params(
       core_api::power::RequestKeepAwake::Params::Create(*args_));
   EXTENSION_FUNCTION_VALIDATE(params);
   EXTENSION_FUNCTION_VALIDATE(params->level != core_api::power::LEVEL_NONE);
-  PowerApiManager::Get(browser_context())->AddRequest(
-      extension_id(), params->level);
+  PowerAPI::Get(browser_context())->AddRequest(extension_id(), params->level);
   return true;
 }
 
 bool PowerReleaseKeepAwakeFunction::RunSync() {
-  PowerApiManager::Get(browser_context())->RemoveRequest(extension_id());
+  PowerAPI::Get(browser_context())->RemoveRequest(extension_id());
   return true;
 }
 
+// static
+PowerAPI* PowerAPI::Get(content::BrowserContext* context) {
+  return BrowserContextKeyedAPIFactory<PowerAPI>::Get(context);
+}
+
+// static
+BrowserContextKeyedAPIFactory<PowerAPI>* PowerAPI::GetFactoryInstance() {
+  return g_factory.Pointer();
+}
+
+void PowerAPI::AddRequest(const std::string& extension_id,
+                          core_api::power::Level level) {
+  extension_levels_[extension_id] = level;
+  UpdatePowerSaveBlocker();
+}
+
+void PowerAPI::RemoveRequest(const std::string& extension_id) {
+  extension_levels_.erase(extension_id);
+  UpdatePowerSaveBlocker();
+}
+
+void PowerAPI::SetCreateBlockerFunctionForTesting(
+    CreateBlockerFunction function) {
+  create_blocker_function_ =
+      !function.is_null() ? function
+                          : base::Bind(&content::PowerSaveBlocker::Create);
+}
+
+void PowerAPI::OnExtensionUnloaded(content::BrowserContext* browser_context,
+                                   const Extension* extension,
+                                   UnloadedExtensionInfo::Reason reason) {
+  RemoveRequest(extension->id());
+  UpdatePowerSaveBlocker();
+}
+
+PowerAPI::PowerAPI(content::BrowserContext* context)
+    : browser_context_(context),
+      create_blocker_function_(base::Bind(&content::PowerSaveBlocker::Create)),
+      current_level_(core_api::power::LEVEL_SYSTEM) {
+  ExtensionRegistry::Get(browser_context_)->AddObserver(this);
+}
+
+PowerAPI::~PowerAPI() {
+}
+
+void PowerAPI::UpdatePowerSaveBlocker() {
+  if (extension_levels_.empty()) {
+    power_save_blocker_.reset();
+    return;
+  }
+
+  core_api::power::Level new_level = core_api::power::LEVEL_SYSTEM;
+  for (ExtensionLevelMap::const_iterator it = extension_levels_.begin();
+       it != extension_levels_.end(); ++it) {
+    if (it->second == core_api::power::LEVEL_DISPLAY)
+      new_level = it->second;
+  }
+
+  // If the level changed and we need to create a new blocker, do a swap
+  // to ensure that there isn't a brief period where power management is
+  // unblocked.
+  if (!power_save_blocker_ || new_level != current_level_) {
+    content::PowerSaveBlocker::PowerSaveBlockerType type =
+        LevelToPowerSaveBlockerType(new_level);
+    scoped_ptr<content::PowerSaveBlocker> new_blocker(
+        create_blocker_function_.Run(type,
+                                     content::PowerSaveBlocker::kReasonOther,
+                                     kPowerSaveBlockerDescription));
+    power_save_blocker_.swap(new_blocker);
+    current_level_ = new_level;
+  }
+}
+
+void PowerAPI::Shutdown() {
+  // Unregister here rather than in the d'tor; otherwise this call will recreate
+  // the already-deleted ExtensionRegistry.
+  ExtensionRegistry::Get(browser_context_)->RemoveObserver(this);
+  power_save_blocker_.reset();
+}
+
 }  // namespace extensions