Add an accessibility setting to expose password values.

Source/core/accessibility/AXObject.cpp

Index: Source/core/accessibility/AXObject.cpp
diff --git a/Source/core/accessibility/AXObject.cpp b/Source/core/accessibility/AXObject.cpp
index 89f6e47099b1cfdc9644fefe8fbceac54b1d5804..69216056d6e90800a94d00a5a620c75906475241 100644
--- a/Source/core/accessibility/AXObject.cpp
+++ b/Source/core/accessibility/AXObject.cpp
@@ -34,6 +34,7 @@
 #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"
@@ -214,6 +215,15 @@ bool AXObject::isMenuRelated() const
     }
 }
 
+bool AXObject::isPasswordFieldAndShouldHideValue() const
+{
+    Settings* settings = document()->settings();
+    if (!settings || settings->accessibilityPasswordValuesEnabled())
+        return false;
+
+    return isPasswordField();
+}
+
 bool AXObject::isTextControl() const
 {
     switch (roleValue()) {