Implement NSAccessibilityScrollToVisibleAction on Mac

content/renderer/accessibility/render_accessibility_impl.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 CONTENT_RENDERER_ACCESSIBILITY_RENDER_ACCESSIBILITY_IMPL_H_
 #define CONTENT_RENDERER_ACCESSIBILITY_RENDER_ACCESSIBILITY_IMPL_H_
 
 #include <vector>
 
 #include "base/containers/hash_tables.h"
@@ skipping 114 matching lines @@
   void OnSetScrollOffset(int acc_obj_id, gfx::Point offset);
   void OnSetFocus(int acc_obj_id);
   void OnSetSelection(int anchor_acc_obj_id,
                       int anchor_offset,
                       int focus_acc_obj_id,
                       int focus_offset);
   void OnSetValue(int acc_obj_id, base::string16 value);
   void OnShowContextMenu(int acc_obj_id);
 
   void AddPdfTreeToUpdate(AXContentTreeUpdate* update);
+  void ScrollPdf(int id_to_make_visible);
 
   // Events from Blink are collected until they are ready to be
   // sent to the browser.
   std::vector<AccessibilityHostMsg_EventParams> pending_events_;
 
   // The adapter that exposes Blink's accessibility tree to AXTreeSerializer.
   BlinkAXTreeSource tree_source_;
 
   // The serializer that sends accessibility messages to the browser process.
   using BlinkAXTreeSerializer =
@@ skipping 31 matching lines @@
 
   // So we can queue up tasks to be executed later.
   base::WeakPtrFactory<RenderAccessibilityImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderAccessibilityImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_ACCESSIBILITY_RENDERER_ACCESSIBILITY_H_