Initial WebAudio API stubs

components/script/dom/webidls/OscillatorNode.webidl

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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+/*
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/#oscillatornode
+ */
+
+enum OscillatorType {
+  "sine",
+  "square",
+  "sawtooth",
+  "triangle",
+  "custom"
+};
+
+dictionary OscillatorOptions : AudioNodeOptions {
+  OscillatorType type = "sine";
+  float frequency = 440;
+  float detune = 0;
+  PeriodicWave periodicWave;
+};
+
+[Exposed=Window,
+ Constructor (BaseAudioContext context, optional OscillatorOptions options)]
+interface OscillatorNode : AudioScheduledSourceNode {
+/*  [SetterThrows]
+  attribute OscillatorType type;
+
+  readonly attribute AudioParam frequency;
+  readonly attribute AudioParam detune;
+
+  void setPeriodicWave (PeriodicWave periodicWave);*/
+};