[MediaStream API] Allow empty MediaStreams

Source/WebCore/platform/mediastream/MediaStreamDescriptor.h

 /*
  * Copyright (C) 2011 Ericsson AB. All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 91 matching lines @@
         : m_client(0)
         , m_id(id)
         , m_ended(false)
     {
         ASSERT(m_id.length());
         for (size_t i = 0; i < audioSources.size(); i++)
             m_audioComponents.append(MediaStreamComponent::create(this, audioSources[i]));
 
         for (size_t i = 0; i < videoSources.size(); i++)
             m_videoComponents.append(MediaStreamComponent::create(this, videoSources[i]));
-
-        if (!audioSources.size() && !videoSources.size())
-            m_ended = true;
     }
 
     MediaStreamDescriptor(const String& id, const MediaStreamComponentVector& audioComponents, const MediaStreamComponentVector& videoComponents)
         : m_client(0)
         , m_id(id)
         , m_ended(false)
     {
         ASSERT(m_id.length());
         for (MediaStreamComponentVector::const_iterator iter = audioComponents.begin(); iter != audioComponents.end(); ++iter) {
             (*iter)->setStream(this);
@@ skipping 14 matching lines @@
     RefPtr<ExtraData> m_extraData;
 };
 
 typedef Vector<RefPtr<MediaStreamDescriptor> > MediaStreamDescriptorVector;
 
 } // namespace WebCore
 
 #endif // ENABLE(MEDIA_STREAM)
 
 #endif // MediaStreamDescriptor_h