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

ui/accessibility/ax_view_state.h

Index: ui/accessibility/ax_view_state.h
diff --git a/ui/accessibility/ax_view_state.h b/ui/accessibility/ax_view_state.h
index a20a65d6e7d41190cf9562522913e6b535b8c0e7..b55f869e8211cabf8b37b1e3e99acaaeb2effd43 100644
--- a/ui/accessibility/ax_view_state.h
+++ b/ui/accessibility/ax_view_state.h
@@ -77,10 +77,11 @@ struct AX_EXPORT AXViewState {
   // 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_;