bindings: Adds virtual ScriptWrappable::wrap method.

Source/modules/webaudio/AudioBufferSourceNode.h

Index: Source/modules/webaudio/AudioBufferSourceNode.h
diff --git a/Source/modules/webaudio/AudioBufferSourceNode.h b/Source/modules/webaudio/AudioBufferSourceNode.h
index 0ebc212428fb746fb8d149d9157a67d1bd84cd37..8b2414476612e56535f512678c9af8d693ea3d6a 100644
--- a/Source/modules/webaudio/AudioBufferSourceNode.h
+++ b/Source/modules/webaudio/AudioBufferSourceNode.h
@@ -43,6 +43,7 @@ class AudioContext;
 // It generally will be used for short sounds which require a high degree of scheduling flexibility (can playback in rhythmically perfect ways).
 
 class AudioBufferSourceNode FINAL : public AudioScheduledSourceNode {
+    DEFINE_WRAPPERTYPEINFO();
 public:
     static AudioBufferSourceNode* create(AudioContext*, float sampleRate);