start/stop method for AudioBufferSourceNodes and OscillatorNodes can take no args.

Source/modules/webaudio/AudioScheduledSourceNode.h

 /*
  * 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
@@ skipping 50 matching lines @@
         NotifyEndedTask(PassRefPtr<AudioScheduledSourceNode> scheduledNode);
         void notifyEnded();
 
     private:
         RefPtr<AudioScheduledSourceNode> m_scheduledNode;
     };
 
     AudioScheduledSourceNode(AudioContext*, float sampleRate);
 
     // Scheduling.
-    void start(double when);
-    void stop(double when);
+    void start(double when = 0);
+    void stop(double when = 0);
 
     void noteOn(double when);
     void noteOff(double when);
 
     unsigned short playbackState() const { return static_cast<unsigned short>(m_playbackState); }
     bool isPlayingOrScheduled() const { return m_playbackState == PLAYING_STATE || m_playbackState == SCHEDULED_STATE; }
     bool hasFinished() const { return m_playbackState == FINISHED_STATE; }
 
     EventListener* onended(DOMWrapperWorld* isolatedWorld) { return getAttributeEventListener(EventTypeNames::ended, isolatedWorld); }
     void setOnended(PassRefPtr<EventListener>, DOMWrapperWorld* isolatedWorld = 0);
@@ skipping 27 matching lines @@
     double m_endTime; // in seconds
 
     bool m_hasEndedListener;
 
     static const double UnknownTime;
 };
 
 } // namespace WebCore
 
 #endif // AudioScheduledSourceNode_h