Implement ChromeVox next/previous line, link, and heading.

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

Index: chrome/browser/resources/chromeos/chromevox/cvox2/background/background.extjs
diff --git a/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.extjs b/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.extjs
index 207d70732f405a2234804763e1e61a6ed1adc7bb..8d21b34b117f9847e077537432233ac7e24898c8 100644
--- a/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.extjs
+++ b/chrome/browser/resources/chromeos/chromevox/cvox2/background/background.extjs
@@ -67,7 +67,26 @@ MockTts.prototype = {
     return this.utterances.some(function(t) {
       return t.indexOf(textString) != -1;
     });
-  }
+  },
+
+  /**
+   * Waits for the given strings to be spoken. If satisfied, |opt_callback| is
+   * called.
+   * @param {!Array.<string>} textStrings
+   * @param {function() : void=} opt_callback
+   */
+  waitForSpeech: function(textStrings, opt_callback) {
+    if (this.checkIfSubstringWasSpoken(textStrings[0])) {
+      textStrings.splice(0, 1);
+      if (textStrings.length == 0) {
+        if (opt_callback)
+          opt_callback();
+        this.utterances.length = 0;
+        return;
+      }
+    }
+    setTimeout(this.waitForSpeech.bind(this, textStrings, opt_callback), 100);

[dmazzoni, 2014/09/26 06:08:52]

Rather than a timeout, could you make a way to register a callback that gets
called every time there's an utterance?

+  },
 };
 
 /** Tests that ChromeVox classic is in this context. */
@@ -110,3 +129,18 @@ TEST_F('BackgroundTest', 'DesktopFocus', function() {
     testButton.focus();
   });
 });
+
+TEST_F('BackgroundTest', 'InitialFeedback', function() {
+  this.runWithDocument(function() {/*!
+    <p>start
+    <p>end
+  */},
+  function() {
+    cvox.ChromeVox.tts.waitForSpeech(['start'], function() {
+      cvox2.global.backgroundObj.onGotCommand('nextLine');
+      cvox.ChromeVox.tts.waitForSpeech(['end'], function() {
+        testDone();
+      });
+    });
+  }.bind(this));
+});