Add ChromeVox panel and implement caption display functionality.

chrome/browser/resources/chromeos/chromevox/host/chrome/tts_background.js

Index: chrome/browser/resources/chromeos/chromevox/host/chrome/tts_background.js
diff --git a/chrome/browser/resources/chromeos/chromevox/host/chrome/tts_background.js b/chrome/browser/resources/chromeos/chromevox/host/chrome/tts_background.js
index c323d8020b0acb9bba5c12204c7211186977f519..5686af673d056c2a3e11edf88d5a2a740859c508 100644
--- a/chrome/browser/resources/chromeos/chromevox/host/chrome/tts_background.js
+++ b/chrome/browser/resources/chromeos/chromevox/host/chrome/tts_background.js
@@ -14,6 +14,7 @@ goog.require('cvox.AbstractTts');
 goog.require('cvox.ChromeTtsBase');
 goog.require('cvox.ChromeVox');
 goog.require('cvox.MathMap');
+goog.require('cvox.PanelCommand');
 goog.require('goog.i18n.MessageFormat');
 
 
@@ -301,6 +302,9 @@ cvox.TtsBackground.prototype.speakUsingQueue_ = function(utterance, queueMode) {
   // make a note that we're going to stop speech.
   if (queueMode == cvox.QueueMode.FLUSH ||
       queueMode == cvox.QueueMode.CATEGORY_FLUSH) {
+    (new cvox.PanelCommand(
+        cvox.PanelCommandType.CLEAR_SPEECH)).send();
+
     if (this.shouldCancel_(this.currentUtterance_, utterance, queueMode)) {
       this.cancelUtterance_(this.currentUtterance_);
       this.currentUtterance_ = null;
@@ -320,6 +324,23 @@ cvox.TtsBackground.prototype.speakUsingQueue_ = function(utterance, queueMode) {
   // Next, add the new utterance to the queue.
   this.utteranceQueue_.push(utterance);
 
+  console.log('Utterance: ' + utterance.textString);
+  console.log('Properties: ' + JSON.stringify(utterance.properties));
+  console.log('Default properties: ' + JSON.stringify(this.ttsProperties));
+
+  // Update the caption panel.
+  if (utterance.properties &&
+      utterance.properties['pitch'] &&
+      utterance.properties['pitch'] < this.ttsProperties['pitch']) {
+    (new cvox.PanelCommand(
+        cvox.PanelCommandType.ADD_ANNOTATION_SPEECH,
+        utterance.textString)).send();
+  } else {
+    (new cvox.PanelCommand(
+        cvox.PanelCommandType.ADD_NORMAL_SPEECH,
+        utterance.textString)).send();
+  }
+
   // Now start speaking the next item in the queue.
   this.startSpeakingNextItemInQueue_();
 };
@@ -499,6 +520,8 @@ cvox.TtsBackground.prototype.stop = function() {
 
   this.utteranceQueue_.length = 0;
 
+  (new cvox.PanelCommand(
+      cvox.PanelCommandType.CLEAR_SPEECH)).send();
   chrome.tts.stop();
 };