Use fake Input Device Settings with chrome://device-emulator

chrome/browser/resources/chromeos/emulator/audio_settings.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.
 
 /** @enum {string} */ var AudioNodeType = {
   HEADPHONE: 'HEADPHONE',
   MIC: 'MIC',
   USB: 'USB',
   BLUETOOTH: 'BLUETOOTH',
   HDMI: 'HDMI',
@@ skipping 90 matching lines @@
           {name: 'Aokr', type: AudioNodeType.AOKR},
           {name: 'Post Mix Loopback', type: AudioNodeType.POST_MIX_LOOPBACK},
           {name: 'Post Dsp Loopback', type: AudioNodeType.POST_DSP_LOOPBACK},
           {name: 'Other', type: AudioNodeType.OTHER}
         ];
       }
     },
   },
 
   ready: function() {
-    this.title = 'Audio';
-  },
-
-  initialize: function() {
-    if (!this.initialized) {
-      chrome.send('requestAudioNodes');
-      this.initialized = true;
-    }
+    chrome.send('requestAudioNodes');
   },
 
   /**
    * Adds a new node with default settings to the list of nodes.
    */
   appendNewNode: function() {
     var newNode = new AudioNode();
     newNode.id += this.nodeCount;
     this.nodeCount++;
     this.push('nodes', newNode);
@@ skipping 71 matching lines @@
     /** @type {!Array<!AudioNode>} */ var newNodeList = [];
     for (var i = 0; i < nodeList.length; ++i) {
       // Create a new audio node and add all the properties from |nodeList[i]|.
       var node = new AudioNode();
       Object.assign(node, nodeList[i]);
       newNodeList.push(node);
     }
     this.nodes = newNodeList;
   }
 });