Keep AudioScheduledSourceNode alive until onended is called.

Source/modules/webaudio/OscillatorNode.cpp

 /*
  * 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 56 matching lines @@
     m_frequency = AudioParam::create(context, "frequency", 440, 0, 100000);
     // Default to no detuning.
     m_detune = AudioParam::create(context, "detune", 0, -4800, 4800);
 
     // Sets up default wavetable.
     setType(m_type);
 
     // An oscillator is always mono.
     addOutput(adoptPtr(new AudioNodeOutput(this, 1)));
 
+    suspendIfNeeded();
     initialize();
 }
 
 OscillatorNode::~OscillatorNode()
 {
     uninitialize();
 }
 
 String OscillatorNode::type() const
 {
@@ skipping 261 matching lines @@
 }
 
 bool OscillatorNode::propagatesSilence() const
 {
     return !isPlayingOrScheduled() || hasFinished() || !m_periodicWave.get();
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)