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

ui/views/controls/textfield/textfield.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_H_
 #define UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 347 matching lines @@
   int GetDragSelectionDelay() const override;
   void OnBeforePointerAction() override;
   void OnAfterPointerAction(bool text_changed, bool selection_changed) override;
   // Callers within Textfield should call UpdateAfterChange depending on the
   // return value.
   bool PasteSelectionClipboard() override;
   void UpdateSelectionClipboard() override;
 
   // 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). If |clear_first| is true, clears the existing

[msw, 2016/10/27 17:55:09]

nit: keep this consistent with any changes to the omnibox function comment.

[Patti Lor, 2016/10/31 00:35:05]

Done.

+  // value first and sets it to |new_value|. If false, deletes whatever's
+  // selected and replaces it with |new_value|. The cursor is then placed at the
+  // end of |new_value|.
+  void AccessibilitySetValue(const base::string16& new_value, bool clear_first);
 
   // Updates the painted background color.
   void UpdateBackgroundColor();
 
   // Updates the border per the state of |invalid_|.
   void UpdateBorder();
 
   // Does necessary updates when the text and/or cursor position changes.
   void UpdateAfterChange(bool text_changed, bool cursor_changed);
 
@@ skipping 153 matching lines @@
 
   // Used to bind callback functions to this object.
   base::WeakPtrFactory<Textfield> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Textfield);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_H_