Implement IIRFilter node for WebAudio.

third_party/WebKit/Source/modules/webaudio/AudioContext.idl

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple 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
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     [RaisesException, MeasureAs=AudioContextCreateMediaElementSource] MediaElementAudioSourceNode createMediaElementSource(HTMLMediaElement mediaElement);
 
     [RaisesException, MeasureAs=AudioContextCreateMediaStreamSource] MediaStreamAudioSourceNode createMediaStreamSource(MediaStream mediaStream);
     [RaisesException, MeasureAs=AudioContextCreateMediaStreamDestination] MediaStreamAudioDestinationNode createMediaStreamDestination();
 
     // Processing nodes
     [RaisesException, MeasureAs=AudioContextCreateGain] GainNode createGain();
     [RaisesException, MeasureAs=AudioContextCreateDelay] DelayNode createDelay(optional double maxDelayTime);
     [RaisesException, MeasureAs=AudioContextCreateBiquadFilter] BiquadFilterNode createBiquadFilter();
+    [RaisesException, MeasureAs=AudioContextCreateIIRFilter] IIRFilterNode createIIRFilter(sequence<double> feedForward, sequence<double> feedBack);
     [RaisesException, MeasureAs=AudioContextCreateWaveShaper] WaveShaperNode createWaveShaper();
     [RaisesException, MeasureAs=AudioContextCreatePanner] PannerNode createPanner();
     [RaisesException, MeasureAs=AudioContextCreateConvolver] ConvolverNode createConvolver();
     [RaisesException, MeasureAs=AudioContextCreateDynamicsCompressor] DynamicsCompressorNode createDynamicsCompressor();
     [RaisesException, MeasureAs=AudioContextCreateAnalyser] AnalyserNode createAnalyser();
     [RaisesException, MeasureAs=AudioContextCreateScriptProcessor] ScriptProcessorNode createScriptProcessor(optional unsigned long bufferSize, optional unsigned long numberOfInputChannels, optional unsigned long numberOfOutputChannels);
     [RaisesException, MeasureAs=AudioContextCreateStereoPanner] StereoPannerNode createStereoPanner();
     [RaisesException, MeasureAs=AudioContextCreateOscillator] OscillatorNode createOscillator();
     [RaisesException, MeasureAs=AudioContextCreatePeriodicWave] PeriodicWave createPeriodicWave(Float32Array real, Float32Array imag, optional Dictionary options);
 
     // Channel splitting and merging
     [RaisesException, MeasureAs=AudioContextCreateChannelSplitter] ChannelSplitterNode createChannelSplitter(optional unsigned long numberOfOutputs);
     [RaisesException, MeasureAs=AudioContextCreateChannelMerger] ChannelMergerNode createChannelMerger(optional unsigned long numberOfInputs);
 
     // Close
     [MeasureAs=AudioContextClose, CallWith=ScriptState, ImplementedAs=closeContext] Promise<void> close();
 
     // Pause/resume
     [MeasureAs=AudioContextSuspend, CallWith=ScriptState, ImplementedAs=suspendContext] Promise<void> suspend();
     [MeasureAs=AudioContextResume, CallWith=ScriptState, ImplementedAs=resumeContext] Promise<void> resume();
 
     attribute EventHandler onstatechange;
 };