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

Source/modules/webaudio/AudioBufferSourceNode.h

 /*
  * 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 44 matching lines @@
     // setBuffer() is called on the main thread.  This is the buffer we use for playback.
     // returns true on success.
     bool setBuffer(AudioBuffer*);
     AudioBuffer* buffer() { return m_buffer.get(); }
 
     // numberOfChannels() returns the number of output channels.  This value equals the number of channels from the buffer.
     // If a new buffer is set with a different number of channels, then this value will dynamically change.
     unsigned numberOfChannels();
 
     // Play-state
-    void startGrain(double when, double grainOffset);
-    void startGrain(double when, double grainOffset, double grainDuration);
+    void start(double when = 0);
+    void start(double when, double grainOffset, double grainDuration = 0);
 
     void noteGrainOn(double when, double grainOffset, double grainDuration);
 
     // Note: the attribute was originally exposed as .looping, but to be more consistent in naming with <audio>
     // and with how it's described in the specification, the proper attribute name is .loop
     // The old attribute is kept for backwards compatibility.
     bool loop() const { return m_isLooping; }
     void setLoop(bool looping) { m_isLooping = looping; }
 
     // Loop times in seconds.
@@ skipping 62 matching lines @@
     // the pitch rate. We manually manage ref-counting because we want to use RefTypeConnection.
     PannerNode* m_pannerNode;
 
     // This synchronizes process() with setBuffer() which can cause dynamic channel count changes.
     mutable Mutex m_processLock;
 };
 
 } // namespace WebCore
 
 #endif // AudioBufferSourceNode_h