chrome.settingsPrivate: Implement onPrefsChanged event handling.

chrome/browser/extensions/api/settings_private/settings_private_event_router_factory.h

Index: chrome/browser/extensions/api/settings_private/settings_private_event_router_factory.h
diff --git a/chrome/browser/extensions/api/settings_private/settings_private_event_router_factory.h b/chrome/browser/extensions/api/settings_private/settings_private_event_router_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..653c9bdb84f9a57633b04d4447cbaa17dfb7859b
--- /dev/null
+++ b/chrome/browser/extensions/api/settings_private/settings_private_event_router_factory.h
@@ -0,0 +1,51 @@
+// Copyright 2015 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 CHROME_BROWSER_EXTENSIONS_API_SETTINGS_PRIVATE_SETTINGS_PRIVATE_EVENT_ROUTER_FACTORY_H_
+#define CHROME_BROWSER_EXTENSIONS_API_SETTINGS_PRIVATE_SETTINGS_PRIVATE_EVENT_ROUTER_FACTORY_H_
+
+#include "base/memory/singleton.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+namespace extensions {
+
+class SettingsPrivateEventRouter;
+
+// This is a factory class used by the BrowserContextDependencyManager
+// to instantiate the settingsPrivate event router per profile (since the
+// extension event router is per profile).
+class SettingsPrivateEventRouterFactory
+    : public BrowserContextKeyedServiceFactory {
+ public:
+  // Returns the SettingsPrivateEventRouter for |profile|, creating it if
+  // it is not yet created.
+  static SettingsPrivateEventRouter* GetForProfile(
+      content::BrowserContext* context);
+
+  // Returns the SettingsPrivateEventRouterFactory instance.
+  static SettingsPrivateEventRouterFactory* GetInstance();
+
+ protected:
+  // BrowserContextKeyedBaseFactory overrides:
+  content::BrowserContext* GetBrowserContextToUse(
+      content::BrowserContext* context) const override;
+  bool ServiceIsCreatedWithBrowserContext() const override;
+  bool ServiceIsNULLWhileTesting() const override;
+
+ private:
+  friend struct DefaultSingletonTraits<SettingsPrivateEventRouterFactory>;
+
+  SettingsPrivateEventRouterFactory();
+  ~SettingsPrivateEventRouterFactory() override;
+
+  // BrowserContextKeyedServiceFactory:
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* profile) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(SettingsPrivateEventRouterFactory);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_SETTINGS_PRIVATE_SETTINGS_PRIVATE_EVENT_ROUTER_FACTORY_H_