AudioContext.decodeAudioData returns a Promise

Source/modules/webaudio/AudioContext.h

Index: Source/modules/webaudio/AudioContext.h
diff --git a/Source/modules/webaudio/AudioContext.h b/Source/modules/webaudio/AudioContext.h
index d74b0cc089ea10bb9a9d6be7ac64e4a567f0d455..010b68da5dc3d7cc4e45605d87635be1f093e306 100644
--- a/Source/modules/webaudio/AudioContext.h
+++ b/Source/modules/webaudio/AudioContext.h
@@ -124,7 +124,7 @@ public:
     AudioBuffer* createBuffer(unsigned numberOfChannels, size_t numberOfFrames, float sampleRate, ExceptionState&);
 
     // Asynchronous audio file data decoding.
-    void decodeAudioData(DOMArrayBuffer*, AudioBufferCallback*, AudioBufferCallback*, ExceptionState&);
+    ScriptPromise decodeAudioData(ScriptState*, DOMArrayBuffer*, AudioBufferCallback*, AudioBufferCallback*, ExceptionState&);
 
     AudioListener* listener() { return m_listener.get(); }
 
@@ -283,6 +283,7 @@ public:
     // Get the security origin for this audio context.
     SecurityOrigin* securityOrigin() const;
 
+    void removeAudioDecoderResolver(ScriptPromiseResolver*);
 protected:
     explicit AudioContext(Document*);
     AudioContext(Document*, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate);
@@ -417,6 +418,8 @@ private:
     void setContextState(AudioContextState);
 
     AsyncAudioDecoder m_audioDecoder;
+    // A vector of the ScriptPromiseResolvers the decodeAudioData method uses.
+    WillBeHeapVector<RefPtrWillBeMember<ScriptPromiseResolver>> m_audioDecoderResolvers;
 
     // Collection of nodes where the channel count mode has changed. We want the channel count mode
     // to change in the pre- or post-rendering phase so as not to disturb the running audio thread.