Roll IDLs forward.

third_party/WebCore/Modules/webaudio/AudioBufferSourceNode.idl

Index: third_party/WebCore/Modules/webaudio/AudioBufferSourceNode.idl
diff --git a/third_party/WebCore/Modules/webaudio/AudioBufferSourceNode.idl b/third_party/WebCore/Modules/webaudio/AudioBufferSourceNode.idl
index a838c791f42362faaf9a0ff303be97a7a87a74b0..4988f0cf43b19c1e7a59576b42787e4fb5e95605 100644
--- a/third_party/WebCore/Modules/webaudio/AudioBufferSourceNode.idl
+++ b/third_party/WebCore/Modules/webaudio/AudioBufferSourceNode.idl
@@ -41,15 +41,19 @@
     readonly attribute AudioParam playbackRate;
 
     attribute boolean loop; // This is the proper attribute name from the specification.
-    attribute boolean looping; // This is an alias for the .loop attribute for backwards compatibility.
+
+    attribute double loopStart;
+    attribute double loopEnd;
 
     [V8MeasureAs=WebAudioStart] void start(in double when);
     [V8MeasureAs=WebAudioStart, ImplementedAs=startGrain] void start(in double when, in double grainOffset, in double grainDuration);
     void stop(in double when);
 
 #if defined(ENABLE_LEGACY_WEB_AUDIO) && ENABLE_LEGACY_WEB_AUDIO
-    [V8MeasureAs=LegacyWebAudioNoteOn] void noteOn(in double when);
-    [V8MeasureAs=LegacyWebAudioNoteOn] void noteGrainOn(in double when, in double grainOffset, in double grainDuration);
+    attribute boolean looping; // This is an alias for the .loop attribute for backwards compatibility.
+
+    [V8MeasureAs=LegacyWebAudio] void noteOn(in double when);
+    [V8MeasureAs=LegacyWebAudio] void noteGrainOn(in double when, in double grainOffset, in double grainDuration);
     void noteOff(in double when);
 #endif
 };