Add support for multimedia timers to TaskQueue on Windows.

webrtc/base/task_queue.h

Index: webrtc/base/task_queue.h
diff --git a/webrtc/base/task_queue.h b/webrtc/base/task_queue.h
index eeabe05fabc886db22bddb0d085bf503d5cf275d..7a91db3666b056eb35c8c692ee5bf36cad5c6d8a 100644
--- a/webrtc/base/task_queue.h
+++ b/webrtc/base/task_queue.h
@@ -254,10 +254,12 @@ class LOCKABLE TaskQueue {
   dispatch_queue_t queue_;
   QueueContext* const context_;
 #elif defined(WEBRTC_WIN)
+  class MultimediaTimer;
   typedef std::unordered_map<UINT_PTR, std::unique_ptr<QueuedTask>>
       DelayedTasks;
   static bool ThreadMain(void* context);
-  static bool ProcessQueuedMessages(DelayedTasks* delayed_tasks);
+  static bool ProcessQueuedMessages(DelayedTasks* delayed_tasks,
+                                    std::vector<MultimediaTimer>* timers);
 
   class WorkerThread : public PlatformThread {
    public: