MacViews/a11y: Allow accessibility clients to focus and unfocus focusable Views.

ui/accessibility/platform/ax_platform_node_delegate.h

 // Copyright 2014 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_PLATFORM_AX_PLATFORM_NODE_DELEGATE_H_
 #define UI_ACCESSIBILITY_PLATFORM_AX_PLATFORM_NODE_DELEGATE_H_
 
 #include "ui/accessibility/ax_enums.h"
 #include "ui/accessibility/ax_export.h"
 #include "ui/gfx/geometry/vector2d.h"
@@ skipping 76 matching lines @@
   // Change the value of a control, such as the text content of a text field.
   // If |clear_first| is true, this replaces all text with the |new_value|.
   // Otherwise this inserts |new_value| at the cursor position, replacing any
   // selected text. The cursor is placed at the end of |new_value|.
   virtual bool SetStringValue(const base::string16& new_value,
                               bool clear_first) = 0;
 
   // Whether SetStringValue() is callable, i.e. if the string value is not read
   // only and if the callback exists.
   virtual bool CanSetStringValue() = 0;
+
+  // Focus or unfocus a View, checking if the View is focusable first.
+  virtual bool SetFocused(bool focused) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_ACCESSIBILITY_PLATFORM_AX_PLATFORM_NODE_DELEGATE_H_