Add an accessibility setting to expose password values.

Source/core/frame/Settings.in

Index: Source/core/frame/Settings.in
diff --git a/Source/core/frame/Settings.in b/Source/core/frame/Settings.in
index de9295de8709b90479ac3c0b1485f013460217f9..00d356207184c2ea4cdfdecf3082a9285e17a812 100644
--- a/Source/core/frame/Settings.in
+++ b/Source/core/frame/Settings.in
@@ -297,5 +297,11 @@ availableHoverTypes type=int, initial=HoverTypeNone, invalidate=MediaQuery
 primaryPointerType type=PointerType, initial=PointerTypeNone, invalidate=MediaQuery
 primaryHoverType type=HoverType, initial=HoverTypeNone, invalidate=MediaQuery
 
+# Whether accessibility support is enabled at all.
 accessibilityEnabled initial=false, invalidate=AccessibilityState
+
+# If true, the value in password fields is exposed to assistive technologies.
+accessibilityPasswordValuesEnabled initial=false
+
+# If true, static text nodes expose inline text box children.
 inlineTextBoxAccessibilityEnabled initial=false