Fix JingleThreadWrapper initialization in PNaCl plugin.

jingle/glue/thread_wrapper.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 JINGLE_GLUE_THREAD_WRAPPER_H_
 #define JINGLE_GLUE_THREAD_WRAPPER_H_
 
 #include <list>
 #include <map>
 
@@ skipping 17 matching lines @@
 //   must pass a valid task runner for the current thread and also delete the
 //   wrapper later.
 class JingleThreadWrapper : public base::MessageLoop::DestructionObserver,
                             public rtc::Thread {
  public:
   // Create JingleThreadWrapper for the current thread if it hasn't been created
   // yet. The thread wrapper is destroyed automatically when the current
   // MessageLoop is destroyed.
   static void EnsureForCurrentMessageLoop();
 
-  // Returns thread wrapper for the current thread. NULL is returned
-  // if EnsureForCurrentMessageLoop() has never been called for this
-  // thread.
+  // Creates JingleThreadWrapper for |task_runner| that runs tasks on the
+  // current thread.
+  static scoped_ptr<JingleThreadWrapper> WrapTaskRunner(
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner);
+
+  // Returns thread wrapper for the current thread or nullptr if it doesn't
+  // exist.
   static JingleThreadWrapper* current();
 
-  explicit JingleThreadWrapper(
-     scoped_refptr<base::SingleThreadTaskRunner> task_runner);
   ~JingleThreadWrapper() override;
 
   // Sets whether the thread can be used to send messages
   // synchronously to another thread using Send() method. Set to false
   // by default to avoid potential jankiness when Send() used on
   // renderer thread. It should be set explicitly for threads that
   // need to call Send() for other threads.
   void set_send_allowed(bool allowed) { send_allowed_ = allowed; }
 
   // MessageLoop::DestructionObserver implementation.
@@ skipping 33 matching lines @@
   int GetDelay() override;
 
   // rtc::Thread overrides.
   void Stop() override;
   void Run() override;
 
  private:
   typedef std::map<int, rtc::Message> MessagesQueue;
   struct PendingSend;
 
+  explicit JingleThreadWrapper(
+     scoped_refptr<base::SingleThreadTaskRunner> task_runner);
+
   void PostTaskInternal(
       int delay_ms, rtc::MessageHandler* handler,
       uint32 message_id, rtc::MessageData* data);
   void RunTask(int task_id);
   void ProcessPendingSends();
 
   // Task runner used to execute messages posted on this thread.
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
   bool send_allowed_;
 
   // |lock_| must be locked when accessing |messages_|.
   base::Lock lock_;
   int last_task_id_;
   MessagesQueue messages_;
   std::list<PendingSend*> pending_send_messages_;
   base::WaitableEvent pending_send_event_;
 
   base::WeakPtr<JingleThreadWrapper> weak_ptr_;
   base::WeakPtrFactory<JingleThreadWrapper> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(JingleThreadWrapper);
 };
 
 }  // namespace jingle_glue
 
 #endif  // JINGLE_GLUE_THREAD_WRAPPER_H_