components: add wifi_sync component

components/wifi_sync/wifi_credential_syncable_service_factory.h

+// 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.
+
+#ifndef COMPONENTS_WIFI_SYNC_WIFI_CREDENTIAL_SYNCABLE_SERVICE_FACTORY_H_
+#define COMPONENTS_WIFI_SYNC_WIFI_CREDENTIAL_SYNCABLE_SERVICE_FACTORY_H_
+
+#include "base/macros.h"
+#include "base/memory/singleton.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+namespace content {
+class BrowserContext;
+}
+
+namespace wifi_sync {
+
+class WifiCredentialSyncableService;
+
+// Singleton that owns all WifiCredentialSyncableServices and
+// associates them with Profiles. Listens for the Profile's
+// destruction notification and cleans up the associated
+// WifiCredentialSyncableServices.
+class WifiCredentialSyncableServiceFactory
+    : public BrowserContextKeyedServiceFactory {
+ public:
+  // Returns the SyncableService for |browser_context|, creating the
+  // SyncableService if one does not already exist.
+  static WifiCredentialSyncableService* GetForBrowserContext(
+      content::BrowserContext* browser_context);
+
+  // Returns the singleton instance. As this class has no public
+  // instance methods, this function is not generally useful for
+  // external callers. This function is public only so that the
+  // Singleton template can reference it.
+  static WifiCredentialSyncableServiceFactory* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<WifiCredentialSyncableServiceFactory>;
+
+  WifiCredentialSyncableServiceFactory();
+  ~WifiCredentialSyncableServiceFactory() override;
+
+  // Implementation of BrowserContextKeyedServiceFactory.
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(WifiCredentialSyncableServiceFactory);
+};
+
+}  // namespace wifi_sync
+
+#endif  // COMPONENTS_WIFI_SYNC_WIFI_CREDENTIAL_SYNCABLE_SERVICE_FACTORY_H_