Initial WebAudio API stubs

components/script/dom/webidls/AudioContext.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-audiocontext
+ */
+
+enum AudioContextLatencyCategory {
+  "balanced",
+  "interactive",
+  "playback"
+};
+
+dictionary AudioContextOptions {
+  AudioContextLatencyCategory latencyHint = "interactive";
+  float sampleRate;
+};
+
+dictionary AudioTimestamp {
+  double contextTime;
+  DOMHighResTimeStamp performanceTime;
+};
+
+[Exposed=Window,
+ Constructor(optional AudioContextOptions contextOptions)]
+interface AudioContext : BaseAudioContext {
+  readonly attribute double baseLatency;
+  readonly attribute double outputLatency;
+
+  AudioTimestamp getOutputTimestamp();
+
+  Promise<void> suspend();
+  Promise<void> close();
+
+  // MediaElementAudioSourceNode createMediaElementSource(HTMLMediaElement mediaElement);
+  // MediaStreamAudioSourceNode createMediaStreamSource(MediaStream mediaStream);
+  // MediaStreamTrackAudioSourceNode createMediaStreamTrackSource(MediaStreamTrack mediaStreamTrack);
+  // MediaStreamAudioDestinationNode createMediaStreamDestination();
+};