Wire up an api to darken screen for accessibility

ui/accessibility/ax_action_data.h

Index: ui/accessibility/ax_action_data.h
diff --git a/ui/accessibility/ax_action_data.h b/ui/accessibility/ax_action_data.h
index 4c0af535749aac9163dd87fc87832cba42cf9dc7..5dc806a15f66ba517fdbb47bdff7cc0131ad1bb6 100644
--- a/ui/accessibility/ax_action_data.h
+++ b/ui/accessibility/ax_action_data.h
@@ -19,6 +19,10 @@ struct AX_EXPORT AXActionData {
   AXActionData(const AXActionData& other);
   virtual ~AXActionData();
 
+  // Add a boolean attribute to this action.
+  void AddBoolAttribute(AXActionBoolAttribute attribute, bool value);
+  bool GetBoolAttribute(AXActionBoolAttribute attr) const;
+
   // Return a string representation of this data, for debugging.
   virtual std::string ToString() const;
 
@@ -53,6 +57,7 @@ struct AX_EXPORT AXActionData {
 
   // The new value for a node, for the SET_VALUE action.
   base::string16 value;
+  std::vector<std::pair<AXActionBoolAttribute, bool>> bool_attributes;
 };
 
 }  // namespace ui