Adds MSAA/IAccessible exposure of web content.

chrome/common/render_messages_internal.h

 // Copyright (c) 2006-2008 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.
 
 // This header is meant to be included in multiple passes, hence no traditional
 // header guard.
 // See ipc_message_macros.h for explanation of the macros and passes.
 
 #include <string>
 #include <vector>
@@ skipping 354 matching lines @@
   IPC_MESSAGE_ROUTED1(ViewMsg_RunFileChooserResponse,
                       std::wstring /* file_name */)
 
   // Used to instruct the RenderView to go into "view source" mode.
   IPC_MESSAGE_ROUTED0(ViewMsg_EnableViewSourceMode)
 
   IPC_MESSAGE_ROUTED2(ViewMsg_UpdateBackForwardListCount,
                       int /* back_list_count */,
                       int /* forward_list_count */)
 
+  // Retreive information from the MSAA DOM subtree, for accessibility purposes.
+  IPC_SYNC_MESSAGE_ROUTED1_1(ViewMsg_GetAccessibilityInfo,
+                             ViewMsg_Accessibility_In_Params
+                             /* input parameters */,
+                             ViewHostMsg_Accessibility_Out_Params
+                             /* output parameters */)
+
+  // Requests the renderer to clear cashed accessibility information. Takes an 
+  // id to clear a specific hashmap entry, and a bool; true clears all, false
+  // does not.
+  IPC_MESSAGE_ROUTED2(ViewMsg_ClearAccessibilityInfo,
+                      int  /* iaccessible_id */,
+                      bool /* clear_all */)
+
   // Get all savable resource links from current webpage, include main
   // frame and sub-frame.
   IPC_MESSAGE_ROUTED1(ViewMsg_GetAllSavableResourceLinksForCurrentPage,
                       GURL /* url of page which is needed to save */)
 
   // Get html data by serializing all frames of current page with lists
   // which contain all resource links that have local copy.
   IPC_MESSAGE_ROUTED3(ViewMsg_GetSerializedHtmlDataForCurrentPageWithLocalLinks,
                       std::vector<std::wstring> /* urls which have local copy */,
                       std::vector<std::wstring> /* paths of local copy */,
@@ skipping 648 matching lines @@
   // beforeunload or unload handler.
   IPC_MESSAGE_ROUTED1(ViewHostMsg_UnloadListenerChanged,
                       bool /* has_listener */)
 
   // Returns the window location of the window this widget is embeded in.
   IPC_SYNC_MESSAGE_ROUTED1_1(ViewHostMsg_GetRootWindowRect,
                              HWND /* window */,
                              gfx::Rect /* Out: Window location */)
 
 IPC_END_MESSAGES(ViewHost)