Add audible, muted to Tab, c.t.query, c.t.update, and c.t.onUpdated where relevant

chrome/test/data/extensions/api_test/tabs/basics/sinewave.js

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+window.sinewave = {
+  play: function(win, frequency) {
+    win.sinewaveData_ = win.sinewaveData_ || {};
+    data = win.sinewaveData_;
+
+    if (!data.audioContext) {
+      data.audioContext = new AudioContext();
+      data.gainNode = data.audioContext.createGain();
+      data.gainNode.gain.value = 0.5;
+      data.gainNode.connect(data.audioContext.destination);
+    }
+    if (!data.oscillator ||
+        data.oscillator.frequency.value != frequency) {
+
+      // Note: We recreate the oscillator each time because this switches the
+      // audio frequency immediately.  Re-using the same oscillator tends to
+      // take several hundred milliseconds to ramp-up/down the frequency.
+      if (data.oscillator) {
+        data.oscillator.stop();
+        data.oscillator.disconnect();
+      }
+      data.oscillator = data.audioContext.createOscillator();
+      data.oscillator.type = OscillatorNode.SINE;
+      data.oscillator.frequency.value = frequency;
+      data.oscillator.connect(data.gainNode);
+    }
+    data.oscillator.start();
+  },
+
+  stop: function(win) {
+    if (win.sinewaveData_)
+      win.sinewaveData_.oscillator.stop();
+  }
+};