MacViews/a11y: Implement NativeViewAccessibilityMac.

ui/views/accessibility/native_view_accessibility.h

 // Copyright (c) 2013 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_ACCESSIBILITY_NATIVE_VIEW_ACCESSIBILITY_H_
 #define UI_VIEWS_ACCESSIBILITY_NATIVE_VIEW_ACCESSIBILITY_H_
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "ui/accessibility/ax_action_data.h"
 #include "ui/accessibility/ax_node_data.h"
 #include "ui/accessibility/platform/ax_platform_node.h"
 #include "ui/accessibility/platform/ax_platform_node_delegate.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/views/views_export.h"
 #include "ui/views/widget/widget_observer.h"
 
 // Set PLATFORM_HAS_NATIVE_VIEW_ACCESSIBILITY_IMPL if this platform has a
 // specific implementation of NativeViewAccessibility::Create().
 #undef PLATFORM_HAS_NATIVE_VIEW_ACCESSIBILITY_IMPL
 
 #if defined(OS_WIN)
 #define PLATFORM_HAS_NATIVE_VIEW_ACCESSIBILITY_IMPL 1
 #endif
 
+#if defined(OS_MACOSX)
+#define PLATFORM_HAS_NATIVE_VIEW_ACCESSIBILITY_IMPL 1
+#endif
+
 #if defined(OS_LINUX) && defined(USE_X11) && !defined(OS_CHROMEOS)
 #define PLATFORM_HAS_NATIVE_VIEW_ACCESSIBILITY_IMPL 1
 #endif
 
 namespace views {
 
 class View;
 class Widget;
 
 class VIEWS_EXPORT NativeViewAccessibility
@@ skipping 52 matching lines @@
   ui::AXPlatformNode* ax_node_;
 
   ui::AXNodeData data_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeViewAccessibility);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_ACCESSIBILITY_NATIVE_VIEW_ACCESSIBILITY_H_