Create video and audio decoder threads on demand.

media/base/message_loop_factory.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 MEDIA_BASE_MESSAGE_LOOP_FACTORY_H_
 #define MEDIA_BASE_MESSAGE_LOOP_FACTORY_H_
 
 #include <map>
 #include <string>
 
@@ skipping 15 matching lines @@
 //
 // TODO(scherkus): replace this with something simpler http://crbug.com/116873
 class MEDIA_EXPORT MessageLoopFactory {
  public:
   MessageLoopFactory();
 
   // Get the message loop associated with |name|. A new MessageLoop
   // is created if the factory doesn't have one associated with |name|.
   //
   // |name| must not be an empty string.
-  MessageLoop* GetMessageLoop(const std::string& name);
+  virtual MessageLoop* GetMessageLoop(const std::string& name);
 
   // Get the message loop proxy associated with |name|. A new MessageLoopProxy
   // is created if the factory doesn't have one associated with |name|.
   //
   // |name| must not be an empty string.
   scoped_refptr<base::MessageLoopProxy> GetMessageLoopProxy(
       const std::string& name);
 
- private:
+ protected:
   // Only allow scoped_ptr<> to delete factory.
   friend class scoped_ptr<MessageLoopFactory>;
-  ~MessageLoopFactory();
+  virtual ~MessageLoopFactory();
 
+ private:
   // Returns the thread associated with |name| creating a new thread if needed.
   base::Thread* GetThread(const std::string& name);
 
   // Lock used to serialize access for the following data members.
   base::Lock lock_;
 
   typedef std::map<std::string, base::Thread*> ThreadMap;
   ThreadMap thread_map_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageLoopFactory);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_MESSAGE_LOOP_FACTORY_H_