Initial implementation of continuous read for ChromeVox Next.

chrome/browser/resources/chromeos/chromevox/testing/mock_tts.js

Index: chrome/browser/resources/chromeos/chromevox/testing/mock_tts.js
diff --git a/chrome/browser/resources/chromeos/chromevox/testing/mock_tts.js b/chrome/browser/resources/chromeos/chromevox/testing/mock_tts.js
index b41c0ad345f499e220b028cafba498ac10a57d31..0915e1120218ccf763628557b16e296418f22ab2 100644
--- a/chrome/browser/resources/chromeos/chromevox/testing/mock_tts.js
+++ b/chrome/browser/resources/chromeos/chromevox/testing/mock_tts.js
@@ -8,6 +8,11 @@
  * @extends {cvox.TtsInterface}
  */
 var MockTts = function() {
+  /**
+   * The event handler for the most recent call to |speak|.
+   * @private
+   */
+  this.onEvent_;
 };
 
 MockTts.prototype = {
@@ -29,6 +34,9 @@ MockTts.prototype = {
 
   /** @override */
   speak: function(textString, queueMode, properties) {
+    if (properties)
+      this.onEvent_ = properties['onEvent'];
+
     this.process_(textString);
   },
 
@@ -69,6 +77,22 @@ MockTts.prototype = {
   },
 
   /**
+   * Fakes an event to |onEvent|.
+   */
+  sendStartEvent: function() {
+    if (this.onEvent_)
+      this.onEvent_({type: 'start'});
+  },
+
+  /**
+   * Fakes an event to |onEvent|.
+   */
+  sendEndEvent: function() {
+    if (this.onEvent_)
+      this.onEvent_({type: 'end'});
+  },
+
+  /**
    * @private
    * @param {string} expectedText Text expected spoken.
    * @param {{startCallback: function() : void,