Refactoring gamepad polling to support dynamically added sources

content/browser/gamepad/gamepad_service.h

Index: content/browser/gamepad/gamepad_service.h
diff --git a/content/browser/gamepad/gamepad_service.h b/content/browser/gamepad/gamepad_service.h
index 22bea8c02a850cd230f5ca2a07b68925dbf899c6..c1c9e5df283faa14e0110012f97c273198ea2f3f 100644
--- a/content/browser/gamepad/gamepad_service.h
+++ b/content/browser/gamepad/gamepad_service.h
@@ -79,6 +79,8 @@ class CONTENT_EXPORT GamepadService {
   // Called on IO thread when a gamepad is disconnected.
   void OnGamepadDisconnected(int index, const blink::WebGamepad& pad);
 
+  GamepadProvider* provider() { return provider_.get(); }
+
  private:
   friend struct base::DefaultSingletonTraits<GamepadService>;
   friend class GamepadServiceTestConstructor;
@@ -88,11 +90,11 @@ class CONTENT_EXPORT GamepadService {
 
   // Constructor for testing. This specifies the data fetcher to use for a
   // provider, bypassing the default platform one.
-  GamepadService(scoped_ptr<GamepadDataFetcher> fetcher);
+  explicit GamepadService(scoped_ptr<GamepadDataFetcher> fetcher);
 
   virtual ~GamepadService();
 
-  static void SetInstance(GamepadService*);
+  static void SetInstance(GamepadService* instance);
 
   void OnUserGesture();