Initial WebAudio API stubs

components/script/dom/webidls/AudioParam.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/#dom-audioparam
+ */
+
+[Exposed=Window]
+interface AudioParam {
+             attribute float value;
+    readonly attribute float defaultValue;
+    readonly attribute float minValue;
+    readonly attribute float maxValue;
+//    AudioParam setValueAtTime(float value, double startTime);
+//    AudioParam linearRampToValueAtTime(float value, double endTime);
+//    AudioParam exponentialRampToValueAtTime(float value, double endTime);
+//    AudioParam setTargetAtTime(float target,
+//                               double startTime,
+//                               float timeConstant);
+//    AudioParam setValueCurveAtTime(sequence<float> values,
+//                                   double startTime,
+//                                   double duration);
+//    AudioParam cancelScheduledValues(double cancelTime);
+//    AudioParam cancelAndHoldAtTime(double cancelTime);
+};