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

ui/accessibility/ax_view_state.h

 // Copyright (c) 2011 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_ACCESSIBILITY_AX_VIEW_STATE_H_
 #define UI_ACCESSIBILITY_AX_VIEW_STATE_H_
 
 #include <stdint.h>
 
 #include "base/callback.h"
@@ skipping 59 matching lines @@
   // index and count should be -1 otherwise.
   int index;
   int count;
 
   // An optional callback that can be used by accessibility clients to
   // set the string value of this view. This only applies to roles where
   // setting the value makes sense, like a text box. Not often used by
   // screen readers, but often used by automation software to script
   // things like logging into portals or filling forms.
   //
-  // This callback is only valid for the lifetime of the view, and should
+  // These callbacks are only valid for the lifetime of the view, and should
   // be a safe no-op if the view is deleted. Typically, accessible views
   // should use a WeakPtr when binding the callback.
   base::Callback<void(const base::string16&)> set_value_callback;

[tapted, 2016/09/27 07:16:30]

Does much change if we require the Callback to have a `bool` "replace" argument?
I think that will be neater

[Patti Lor, 2016/10/20 04:19:34]

Done.

+  base::Callback<void(const base::string16&)> replace_selection_callback;
 
  private:
   uint32_t state_;
 };
 
 }  // namespace ui
 
 #endif  // UI_ACCESSIBILITY_AX_VIEW_STATE_H_