Enabling access notifications for login wizard

chrome/browser/chromeos/login/wizard_accessibility_handler.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/login/wizard_accessibility_handler.h"
 
 #include "chrome/browser/accessibility_events.h"
 #include "chrome/browser/chromeos/cros/cros_library.h"
 #include "chrome/browser/chromeos/cros/speech_synthesis_library.h"
 #include "chrome/common/notification_service.h"
 
 void WizardAccessibilityHandler::Observe(
     NotificationType type,
     const NotificationSource& source,
     const NotificationDetails& details) {
   const AccessibilityControlInfo *info = NULL;
   info = Details<const AccessibilityControlInfo>(details).ptr();
   switch (type.value) {
     case NotificationType::ACCESSIBILITY_CONTROL_FOCUSED:
-      Speak(info->name().c_str());
+      Speak(info->name().c_str(), false, true);
       break;
     case NotificationType::ACCESSIBILITY_CONTROL_ACTION:
       break;
     case NotificationType::ACCESSIBILITY_TEXT_CHANGED:
       break;
     case NotificationType::ACCESSIBILITY_MENU_OPENED:
       break;
     case NotificationType::ACCESSIBILITY_MENU_CLOSED:
       break;
     default:
       NOTREACHED() << "Cannot recognize notification type: " << type.value;
       break;
   }
 }
 
-void WizardAccessibilityHandler::Speak(const char* speak_str) {
+void WizardAccessibilityHandler::Speak(const char* speak_str,
+                                       bool queue,
+                                       bool interruptible) {
   if (chromeos::CrosLibrary::Get()->EnsureLoaded()) {
-    chromeos::CrosLibrary::Get()->GetSpeechSynthesisLibrary()->
-        StopSpeaking();
+    if (queue || !interruptible) {
+      std::string props = "";
+      props.append("enqueue=");
+      props.append(queue ? "1;" : "0;");
+      props.append("interruptible=");
+      props.append(interruptible ? "1;" : "0;");
+      chromeos::CrosLibrary::Get()->GetSpeechSynthesisLibrary()->
+          SetSpeakProperties(props.c_str());
+    }
     chromeos::CrosLibrary::Get()->GetSpeechSynthesisLibrary()->
         Speak(speak_str);
   }
 }