MacViews/a11y: Allow accessibility clients to update the selected text.

ui/views/controls/textfield/textfield.h

Index: ui/views/controls/textfield/textfield.h
diff --git a/ui/views/controls/textfield/textfield.h b/ui/views/controls/textfield/textfield.h
index 55353ee8a4874498dbeff19c73dd9df4b11a7c6d..427b4d0f8bf4183e7c7c6fc9b2a224bbbdbd08d4 100644
--- a/ui/views/controls/textfield/textfield.h
+++ b/ui/views/controls/textfield/textfield.h
@@ -347,8 +347,9 @@ class VIEWS_EXPORT Textfield : public View,
 
   // Handles a request to change the value of this text field from software
   // using an accessibility API (typically automation software, screen readers
-  // don't normally use this). Sets the value and clears the selection.
-  void AccessibilitySetValue(const base::string16& new_value);
+  // don't normally use this). Sets the value and clears the selection. If
+  // |replace| is set, insert at the cursor or replace selected text.
+  void AccessibilitySetValue(const base::string16& new_value, bool replace);
 
   // Updates the painted background color.
   void UpdateBackgroundColor();