Make sure the document's scroll position is always up-to-date before...

content/renderer/renderer_accessibility.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 CONTENT_RENDERER_RENDERER_ACCESSIBILITY_H_
 #define CONTENT_RENDERER_RENDERER_ACCESSIBILITY_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 88 matching lines @@
   // Notifications from WebKit are collected until they are ready to be
   // sent to the browser.
   std::vector<Notification> pending_notifications_;
 
   // Our representation of the browser tree.
   BrowserTreeNode* browser_root_;
 
   // A map from IDs to nodes in the browser tree.
   base::hash_map<int32, BrowserTreeNode*> browser_id_map_;
 
+  // The most recently observed scroll offset of the root document element.
+  // TODO(dmazzoni): remove once https://bugs.webkit.org/show_bug.cgi?id=73460
+  // is fixed.
+  gfx::Size last_scroll_offset_;
+
   // Set if we are waiting for an accessibility notification ack.
   bool ack_pending_;
 
   // True if verbose logging of accessibility events is on.
   bool logging_;
 
   // True if we've sent a load complete notification for this page already.
   bool sent_load_complete_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererAccessibility);
 };
 
 #endif  // CONTENT_RENDERER_RENDERER_ACCESSIBILITY_H_