Add UMA to hotword trigger extension.

chrome/browser/resources/hotword/nacl_manager.js

Index: chrome/browser/resources/hotword/nacl_manager.js
diff --git a/chrome/browser/resources/hotword/nacl_manager.js b/chrome/browser/resources/hotword/nacl_manager.js
index 79c1f3f1104a92f1c755ed883fb7140f1c36403f..60377f646a92cc75b51388c1cc502fd2d3c592f2 100644
--- a/chrome/browser/resources/hotword/nacl_manager.js
+++ b/chrome/browser/resources/hotword/nacl_manager.js
@@ -77,6 +77,8 @@ NaClManager.ManagerState_ = {
 };
 var ManagerState_ = NaClManager.ManagerState_;
 var Error_ = hotword.constants.Error;
+var UmaNaClMessageTimeout_ = hotword.constants.UmaNaClMessageTimeout;
+var UmaNaClPluginError_ = hotword.constants.UmaNaClPluginError;
 
 NaClManager.prototype.__proto__ = cr.EventTarget.prototype;
 
@@ -92,6 +94,18 @@ NaClManager.prototype.handleError_ = function(error) {
 };
 
 /**
+ * Record a plugin error to UMA.
+ * @param {!hotword.constants.UmaNaClPluginError} error
+ * @private
+ */
+NaClManager.prototype.logPluginError_ = function(error) {
+  hotword.metrics.recordEnum(
+      hotword.constants.UmaMetrics.NACL_PLUGIN_ERROR,
+      error,
+      UmaNaClPluginError_.MAX);
+};
+
+/**
  * @return {boolean} True if the recognizer is in a running state.
  */
 NaClManager.prototype.isRunning = function() {
@@ -250,11 +264,15 @@ NaClManager.prototype.initialize = function(naclArch, stream) {
                             false);
 
     plugin.addEventListener('crash',
-                            this.handleError_.bind(this, Error_.NACL_CRASH),
+                            function() {
+                              this.handleError_(Error_.NACL_CRASH);
+                              this.logPluginError_(UmaNaClPluginError_.CRASH);
+                            }.bind(this),
                             false);
     return true;
   }
   this.recognizerState_ = ManagerState_.ERROR;
+  this.logPluginError_(UmaNaClPluginError_.NO_MODULE_FOUND);
   return false;
 };
 
@@ -297,6 +315,31 @@ NaClManager.prototype.waitForMessage_ = function(timeout, message) {
       function() {
         this.recognizerState_ = ManagerState_.ERROR;
         this.handleError_(Error_.TIMEOUT);
+        this.logPluginError_(UmaNaClPluginError_.MESSAGE_TIMEOUT);
+        switch (this.expectingMessage_) {
+          case hotword.constants.NaClPlugin.REQUEST_MODEL:
+            var metricValue = UmaNaClMessageTimeout_.REQUEST_MODEL;
+            break;
+          case hotword.constants.NaClPlugin.MODEL_LOADED:
+            var metricValue = UmaNaClMessageTimeout_.MODEL_LOADED;
+            break;
+          case hotword.constants.NaClPlugin.READY_FOR_AUDIO:
+            var metricValue = UmaNaClMessageTimeout_.READY_FOR_AUDIO;
+            break;
+          case hotword.constants.NaClPlugin.STOPPED:
+            var metricValue = UmaNaClMessageTimeout_.STOPPED;
+            break;
+          case hotword.constants.NaClPlugin.HOTWORD_DETECTED:
+            var metricValue = UmaNaClMessageTimeout_.HOTWORD_DETECTED;
+            break;
+          case hotword.constants.NaClPlugin.MS_CONFIGURED:
+            var metricValue = UmaNaClMessageTimeout_.MS_CONFIGURED;
+            break;
+        }
+        hotword.metrics.recordEnum(
+            hotword.constants.UmaMetrics.NACL_MESSAGE_TIMEOUT,
+            metricValue,
+            UmaNaClMessageTimeout_.MAX);
       }.bind(this), timeout);
   this.expectingMessage_ = message;
 };