Implement suspend/resume for AudioContext

Source/modules/webaudio/AudioContext.idl

 /*
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  * Copyright (C) 2011 Apple Inc. All rights reserved.
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+enum AudioContextState {
+    "suspended",
+    "running",
+    "closed"
+};
+
 [
     GarbageCollected,
     ActiveDOMObject,
     Conditional=WEB_AUDIO,
     Constructor,
     ConstructorCallWith=Document,
     NoInterfaceObject,
     RaisesException=Constructor,
 ] interface AudioContext : EventTarget {
     // All rendered audio ultimately connects to destination, which represents the audio hardware.
     readonly attribute AudioDestinationNode destination;
 
     // All scheduled times are relative to this time in seconds.
     readonly attribute double currentTime;
 
     // All AudioNodes in the context run at this sample-rate (sample-frames per second).
     readonly attribute float sampleRate;
 
     // All panning is relative to this listener.
     readonly attribute AudioListener listener;
 
+    // Current state of the AudioContext
+    readonly attribute AudioContextState state;
+
     [RaisesException] AudioBuffer createBuffer(unsigned long numberOfChannels, unsigned long numberOfFrames, float sampleRate);
 
     // Asynchronous audio file data decoding.
     [RaisesException] void decodeAudioData(ArrayBuffer audioData, AudioBufferCallback successCallback, optional AudioBufferCallback errorCallback);
 
     // Sources
     AudioBufferSourceNode createBufferSource();
 
     [RaisesException] MediaElementAudioSourceNode createMediaElementSource(HTMLMediaElement mediaElement);
 
     [RaisesException] MediaStreamAudioSourceNode createMediaStreamSource(MediaStream mediaStream);
     MediaStreamAudioDestinationNode createMediaStreamDestination();
 
     // Processing nodes
     GainNode createGain();
     [RaisesException] DelayNode createDelay(optional double maxDelayTime);
     BiquadFilterNode createBiquadFilter();
     WaveShaperNode createWaveShaper();
     PannerNode createPanner();
     ConvolverNode createConvolver();
     DynamicsCompressorNode createDynamicsCompressor();
     AnalyserNode createAnalyser();
     [RaisesException] ScriptProcessorNode createScriptProcessor(optional unsigned long bufferSize, optional unsigned long numberOfInputChannels, optional unsigned long numberOfOutputChannels);
     OscillatorNode createOscillator();
     [RaisesException] PeriodicWave createPeriodicWave(Float32Array real, Float32Array imag);
 
     // Channel splitting and merging
     [RaisesException] ChannelSplitterNode createChannelSplitter(optional unsigned long numberOfOutputs);
     [RaisesException] ChannelMergerNode createChannelMerger(optional unsigned long numberOfInputs);
+
+    // Pause/resume
+    [CallWith=ScriptState, ImplementedAs=suspendContext] Promise suspend();
+    [CallWith=ScriptState, ImplementedAs=resumeContext] Promise resume();
 };