Make cvox2 feedback more robust when focusing a text field.

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

Index: chrome/browser/resources/chromeos/chromevox/testing/mock_feedback.js
diff --git a/chrome/browser/resources/chromeos/chromevox/testing/mock_feedback.js b/chrome/browser/resources/chromeos/chromevox/testing/mock_feedback.js
index 795f268bc20ceb8bea6010ff034b15cc067df925..29caaf1a4960a9715ffd9c43f03cc6fe0ce6c815 100644
--- a/chrome/browser/resources/chromeos/chromevox/testing/mock_feedback.js
+++ b/chrome/browser/resources/chromeos/chromevox/testing/mock_feedback.js
@@ -141,6 +141,31 @@ MockFeedback.prototype = {
   },
 
   /**
+   * Adds an expectation that a given utterance will not be spoken.
+   * @param {...(string|RegExp)} var_args One or more utterance to add as
+   *     negative expectations.
+   * @return {MockFeedback} |this| for chaining
+   */
+  expectNoSpeech: function() {

[Peter Lundblad, 2015/08/26 16:56:13]

I think this only works if the unexpected utterance comes first in the queue.
Perhaps that's good enough, but would be good to document.

[dmazzoni, 2015/08/26 18:18:23]

Good point. How about expectNextSpeechUtteranceIsNot()

+    assertFalse(this.replaying_);
+    Array.prototype.forEach.call(arguments, function(text) {
+      this.pendingActions_.push({
+        perform: function() {
+          if (this.pendingUtterances_.length == 0)
+            return false;
+          if (MockFeedback.matchAndConsume_(
+                  text, {}, this.pendingUtterances_)) {
+            throw new Error('Got disallowed utterance "' + text + '".');
+          }
+          return true;
+        }.bind(this),
+        toString: function() { return 'Do not speak \'' + text + '\''; }
+      });
+    }.bind(this));
+    return this;
+  },
+
+  /**
    * Adds an expectation for braille output.
    * @param {string|RegExp} text
    * @param {Object=} opt_props Additional properties to match in the
@@ -218,6 +243,7 @@ MockFeedback.prototype = {
    * @private
    */
   addUtterance_: function(textString, queueMode, properties) {
+    console.log('*** ADDUTTERANCE ' + textString);

[Peter Lundblad, 2015/08/26 16:56:13]

Intentional?

[dmazzoni, 2015/08/26 18:18:23]

Oops, meant to remove that. Is there a way to add a VLOG from JS that I could
turn on temporarily while debugging, like in C++? When a test fails sometimes
it's nice to see exactly what MockFeedback got.

     var callback;
     if (properties && (properties.startCallback || properties.endCallback)) {
       var startCallback = properties.startCallback;