Add an accessibility setting to expose password values.

Source/core/accessibility/AXObject.cpp

 /*
  * Copyright (C) 2008, 2009, 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 16 matching lines @@
  */
 
 #include "config.h"
 #include "core/accessibility/AXObject.h"
 
 #include "core/accessibility/AXObjectCacheImpl.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/editing/VisibleUnits.h"
 #include "core/editing/htmlediting.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/Settings.h"
 #include "core/rendering/RenderListItem.h"
 #include "core/rendering/RenderTheme.h"
 #include "core/rendering/RenderView.h"
 #include "platform/UserGestureIndicator.h"
 #include "platform/text/PlatformLocale.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/text/WTFString.h"
 
 using blink::WebLocalizedString;
 
@@ skipping 160 matching lines @@
     case MenuButtonRole:
     case MenuItemRole:
     case MenuItemCheckBoxRole:
     case MenuItemRadioRole:
         return true;
     default:
         return false;
     }
 }
 
+bool AXObject::isPasswordFieldAndShouldHideValue() const
+{
+    if (!isPasswordField())
+        return false;
+
+    Settings* settings = document()->settings();
+    if (!settings || settings->accessibilityPasswordValuesEnabled())
+        return false;
+
+    return true;

[Mike West, 2014/11/07 09:51:28]

Nit: This seems slightly more readable if you drop the `if` at the top, and
write this as `return isPasswordField();`

[dmazzoni, 2014/11/07 22:33:42]

Done.

+}
+
 bool AXObject::isTextControl() const
 {
     switch (roleValue()) {
     case TextAreaRole:
     case TextFieldRole:
     case ComboBoxRole:
         return true;
     default:
         return false;
     }
@@ skipping 740 matching lines @@
         return ToggleButtonRole;
     if (ariaHasPopup())
         return PopUpButtonRole;
     // We don't contemplate RadioButtonRole, as it depends on the input
     // type.
 
     return ButtonRole;
 }
 
 } // namespace blink