Auto merge of #23282 - josephhutch:OscillatorNodeType, r=ferjm

Implemented type attribute for OscillatorNode interface

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Please see https://github.com/servo/media/pull/242 for implementation of the new oscillator node message.

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components/script/dom/webidls/OscillatorNode.webidl

@@ -24,8 +24,8 @@ dictionary OscillatorOptions : AudioNodeOptions {
 [Exposed=Window,
  Constructor (BaseAudioContext context, optional OscillatorOptions options)]
 interface OscillatorNode : AudioScheduledSourceNode {
-//  [SetterThrows]
-//  attribute OscillatorType type;
+  [SetterThrows]
+  attribute OscillatorType type;
 
   readonly attribute AudioParam frequency;
   readonly attribute AudioParam detune;