Record ChromeVox metrics

chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js

 // Copyright 2014 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.
 
 /**
  * @fileoverview The entry point for all ChromeVox2 related code for the
  * background page.
  */
 
 goog.provide('Background');
@@ skipping 157 matching lines @@
   chrome.accessibilityPrivate.onAccessibilityGesture.addListener(
       this.onAccessibilityGesture_);
 
   /**
    * Maps a non-desktop root automation node to a range position suitable for
    *     restoration.
    * @type {WeakMap<AutomationNode, cursors.Range>}
    * @private
    */
   this.focusRecoveryMap_ = new WeakMap();
+
+  // Record a metric with the mode we're in on startup.
+  var useNext = localStorage['useNext'] !== 'false';
+  chrome.metricsPrivate.recordValue(
+      { metricName: 'Accessibility.CrosChromeVoxNext',
+        type: chrome.metricsPrivate.MetricTypeType.HISTOGRAM_LINEAR,
+        min: 1,  // According to histogram.h, this should be 1 for enums.
+        max: 2,  // Maximum should be exclusive.
+        buckets: 3 },  // Number of buckets: 0, 1 and overflowing 2.
+      useNext ? 1 : 0);
 };
 
 /**
  * Map from gesture names (AXGesture defined in ui/accessibility/ax_enums.idl)
  *     to commands when in Classic mode.
  * @type {Object<string, string>}
  * @const
  */
 Background.GESTURE_CLASSIC_COMMAND_MAP = {
   'click': 'forceClickOnCurrentItem',
@@ skipping 154 matching lines @@
    *                                classic/compat (false).
    * @return {boolean} True to announce current position.
    */
   toggleNext: function(opt_setValue) {
     var useNext;
     if (opt_setValue !== undefined)
       useNext = opt_setValue;
     else
       useNext = localStorage['useNext'] !== 'true';
 
+    if (useNext) {
+      chrome.metricsPrivate.recordUserAction('ChromeVox.ToggleNextOn');
+    } else {
+      chrome.metricsPrivate.recordUserAction('ChromeVox.ToggleNextOff');
+    }
+
     localStorage['useNext'] = useNext;
     if (useNext)
       this.setCurrentRangeToFocus_();
     else
       this.setCurrentRange(null);
 
     var announce = Msgs.getMsg(useNext ?
         'switch_to_next' : 'switch_to_classic');
     cvox.ChromeVox.tts.speak(
         announce, cvox.QueueMode.FLUSH, {doNotInterrupt: true});
@@ skipping 463 matching lines @@
   return new RegExp('^(' + globs.map(function(glob) {
     return glob.replace(/[.+^$(){}|[\]\\]/g, '\\$&')
         .replace(/\*/g, '.*')
         .replace(/\?/g, '.');
   }).join('|') + ')$');
 };
 
 new Background();
 
 });  // goog.scope