Implement StereoPannerNode for robust stereo panning

Source/modules/webaudio/AudioContext.cpp

 /*
  * Copyright (C) 2010, 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 42 matching lines @@
 #include "modules/webaudio/MediaElementAudioSourceNode.h"
 #include "modules/webaudio/MediaStreamAudioDestinationNode.h"
 #include "modules/webaudio/MediaStreamAudioSourceNode.h"
 #include "modules/webaudio/OfflineAudioCompletionEvent.h"
 #include "modules/webaudio/OfflineAudioContext.h"
 #include "modules/webaudio/OfflineAudioDestinationNode.h"
 #include "modules/webaudio/OscillatorNode.h"
 #include "modules/webaudio/PannerNode.h"
 #include "modules/webaudio/PeriodicWave.h"
 #include "modules/webaudio/ScriptProcessorNode.h"
+#include "modules/webaudio/StereoPannerNode.h"
 #include "modules/webaudio/WaveShaperNode.h"
 #include "platform/audio/FFTFrame.h"
 #include "platform/audio/HRTFPanner.h"
 #include "wtf/Atomics.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/text/WTFString.h"
 
 #if DEBUG_AUDIONODE_REFERENCES
 #include <stdio.h>
 #endif
@@ skipping 285 matching lines @@
                 "buffer size (" + String::number(bufferSize)
                 + ") must be a power of two between 256 and 16384.");
         }
         return 0;
     }
 
     refNode(node); // context keeps reference until we stop making javascript rendering callbacks
     return node;
 }
 
+StereoPannerNode* AudioContext::createStereoPanner()
+{
+    ASSERT(isMainThread());
+    return StereoPannerNode::create(this, m_destinationNode->sampleRate());
+}
+
 BiquadFilterNode* AudioContext::createBiquadFilter()
 {
     ASSERT(isMainThread());
     return BiquadFilterNode::create(this, m_destinationNode->sampleRate());
 }
 
 WaveShaperNode* AudioContext::createWaveShaper()
 {
     ASSERT(isMainThread());
     return WaveShaperNode::create(this);
@@ skipping 487 matching lines @@
 
     for (HashSet<AudioNode*>::iterator k = m_deferredCountModeChange.begin(); k != m_deferredCountModeChange.end(); ++k)
         (*k)->updateChannelCountMode();
 
     m_deferredCountModeChange.clear();
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)