Record ChromeVox metrics

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

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js b/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
index dc2fdece34394575665044b27b4eea25786baba3..f4fbea1496a6099e7c72a156a881b0cf5aadcff2 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js
@@ -175,6 +175,16 @@ Background = function() {
    * @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);
 };
 
 /**
@@ -349,6 +359,14 @@ Background.prototype = {
     else
       useNext = localStorage['useNext'] !== 'true';
 
+    if (useNext) {
+      chrome.metricsPrivate.recordUserAction(
+          'Accessibility.ChromeVox.ToggleNextOn');
+    } else {
+      chrome.metricsPrivate.recordUserAction(
+          'Accessibility.ChromeVox.ToggleNextOff');
+    }
+
     localStorage['useNext'] = useNext;
     if (useNext)
       this.setCurrentRangeToFocus_();