Add IPCs to allow assistive technology to scroll the page

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 64 matching lines @@
   // tree of nodes.
   void UpdateBrowserTree(const webkit_glue::WebAccessibility& renderer_node);
 
   // Clear the given node and recursively delete all of its descendants
   // from the browser tree. (Does not delete |browser_node|).
   void ClearBrowserTreeNode(BrowserTreeNode* browser_node);
 
   // Handlers for messages from the browser to the renderer.
   void OnAccessibilityDoDefaultAction(int acc_obj_id);
   void OnAccessibilityNotificationsAck();
+  void OnChangeScrollPosition(int acc_obj_id, int scroll_x, int scroll_y);
   void OnEnableAccessibility();
   void OnSetAccessibilityFocus(int acc_obj_id);
 
+  void OnSetTextSelection(int acc_obj_id, int start_offset, int end_offset);
+
   // Whether or not this notification typically needs to send
   // updates to its children, too.
   bool ShouldIncludeChildren(const Notification& notification);
 
   // Returns the main top-level document for this page, or NULL if there's
   // no view or frame.
   WebKit::WebDocument GetMainDocument();
 
   // So we can queue up tasks to be executed later.
   ScopedRunnableMethodFactory<RendererAccessibility> method_factory_;
@@ skipping 19 matching lines @@
   // 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_