Decouple bluetooth_event_router from extension_system.

chrome/browser/extensions/api/bluetooth/bluetooth_api.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_BLUETOOTH_BLUETOOTH_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_BLUETOOTH_BLUETOOTH_API_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
 #include "chrome/browser/extensions/api/api_function.h"
+#include "chrome/browser/extensions/event_router.h"
 #include "chrome/browser/extensions/extension_function.h"
+#include "chrome/browser/profiles/profile_keyed_service.h"
 #include "device/bluetooth/bluetooth_device.h"
 
 namespace device {
 
 class BluetoothSocket;
 struct BluetoothOutOfBandPairingData;
 
 }  // namespace device
 
 namespace extensions {
+
+class ExtensionBluetoothEventRouter;
+
+// The profile-keyed service that manages the bluetooth extension API.
+class BluetoothAPI : public ProfileKeyedService,
+                     public EventRouter::Observer {
+ public:
+  explicit BluetoothAPI(Profile* profile);
+  virtual ~BluetoothAPI();
+
+  // ProfileKeyedService implementation.
+  virtual void Shutdown() OVERRIDE;
+
+  // Convenience method to get the BluetoothAPI for a profile.

[bryeung, 2012/11/13 15:14:43]

I prefer static methods at the very start of the public block.

[youngki, 2012/11/13 16:09:49]

Done.

+  static BluetoothAPI* Get(Profile* profile);
+
+  ExtensionBluetoothEventRouter* bluetooth_event_router();
+
+  // EventRouter::Observer implementation.
+  virtual void OnListenerAdded(const std::string& event_name) OVERRIDE;
+  virtual void OnListenerRemoved(const std::string& event_name) OVERRIDE;
+
+ private:
+  Profile* profile_;
+
+  // Created lazily on first access.
+  scoped_ptr<ExtensionBluetoothEventRouter> bluetooth_event_router_;
+};
+
 namespace api {
 
 class BluetoothIsAvailableFunction : public SyncExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION_NAME("bluetooth.isAvailable")
 
  protected:
   virtual ~BluetoothIsAvailableFunction() {}
 
   // ExtensionFunction:
@@ skipping 194 matching lines @@
 
  private:
   void OnSuccessCallback();
   void OnErrorCallback();
 };
 
 }  // namespace api
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_BLUETOOTH_BLUETOOTH_API_H_