Add an accessibility setting to expose password values.

Source/core/accessibility/AXObject.h

Index: Source/core/accessibility/AXObject.h
diff --git a/Source/core/accessibility/AXObject.h b/Source/core/accessibility/AXObject.h
index 1e8c1ee1c39f028471cc71680510866aca01f69d..9ca68a162d9239320659fb9642c1ae06b4cfccf8 100644
--- a/Source/core/accessibility/AXObject.h
+++ b/Source/core/accessibility/AXObject.h
@@ -353,6 +353,7 @@ public:
     virtual bool isNativeTextControl() const { return false; } // input or textarea
     virtual bool isNonNativeTextControl() const { return false; } // contenteditable or role=textbox
     virtual bool isPasswordField() const { return false; }
+    virtual bool isPasswordFieldAndShouldHideValue() const;
     virtual bool isProgressIndicator() const { return false; }
     bool isRadioButton() const { return roleValue() == RadioButtonRole; }
     bool isScrollbar() const { return roleValue() == ScrollBarRole; }