Gamepad API support for chrome on android

content/browser/gamepad/gamepad_provider.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 CONTENT_BROWSER_GAMEPAD_GAMEPAD_PROVIDER_H_
 #define CONTENT_BROWSER_GAMEPAD_GAMEPAD_PROVIDER_H_
 
 #include <utility>
 #include <vector>
 
@@ skipping 25 matching lines @@
   // Manually specifies the data fetcher. Used for testing.
   explicit GamepadProvider(scoped_ptr<GamepadDataFetcher> fetcher);
 
   virtual ~GamepadProvider();
 
   // Returns the shared memory handle of the gamepad data duplicated into the
   // given process.
   base::SharedMemoryHandle GetSharedMemoryHandleForProcess(
       base::ProcessHandle renderer_process);
 
+  // Returns the state of polling thread regarding Gamepad Data reads via
+  // low-level data fetcher i.e. Paused or Resuming
+  bool GetPollState();
+
   // Pause and resume the background polling thread. Can be called from any
   // thread.
   void Pause();
   void Resume();
 
   // Registers the given closure for calling when the user has interacted with
   // the device. This callback will only be issued once.
   void RegisterForUserGesture(const base::Closure& closure);
 
   // base::SystemMonitor::DevicesChangedObserver implementation.
@@ skipping 30 matching lines @@
   // accidentally scheduling more than one at any time, when rapidly toggling
   // |is_paused_|.
   bool have_scheduled_do_poll_;
 
   // Lists all observers registered for user gestures, and the thread which
   // to issue the callbacks on. Since we always issue the callback on the
   // thread which the registration happened, and this class lives on the I/O
   // thread, the message loop proxies will normally just be the I/O thread.
   // However, this will be the main thread for unit testing.
   base::Lock user_gesture_lock_;
+
+  // Maximum time allowed for the thread before polling gets paused in
+  // milliseconds after last gamepad data access from consumer
+  static const int64 max_timestamp_before_pause_;
+
   struct ClosureAndThread {
     ClosureAndThread(const base::Closure& c,
                      const scoped_refptr<base::MessageLoopProxy>& m);
     ~ClosureAndThread();
 
     base::Closure closure;
     scoped_refptr<base::MessageLoopProxy> message_loop;
   };
   typedef std::vector<ClosureAndThread> UserGestureObserverVector;
   UserGestureObserverVector user_gesture_observers_;
@@ skipping 15 matching lines @@
   scoped_ptr<base::Thread> polling_thread_;
 
   static GamepadProvider* instance_;
 
   DISALLOW_COPY_AND_ASSIGN(GamepadProvider);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GAMEPAD_GAMEPAD_PROVIDER_H_