Add IPCs to allow assistive technology to scroll the page

content/common/view_messages.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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "content/common/content_export.h"
@@ skipping 1082 matching lines @@
 
 // Relay a request from assistive technology to set focus to a given node.
 IPC_MESSAGE_ROUTED1(ViewMsg_SetAccessibilityFocus,
                     int /* object id */)
 
 // Relay a request from assistive technology to perform the default action
 // on a given node.
 IPC_MESSAGE_ROUTED1(ViewMsg_AccessibilityDoDefaultAction,
                     int /* object id */)
 
+// Relay a request from assistive technology to change the scroll position
+// of a scrollable container (like the whole page, an iframe, etc.).
+IPC_MESSAGE_ROUTED3(ViewMsg_AccessibilityChangeScrollPosition,
+                    int /* object id */,
+                    int /* New x scroll position */,
+                    int /* New y scroll position */)
+
+// Relay a request from assistive technology to set the cursor or
+// selection within an editable text element.
+IPC_MESSAGE_ROUTED3(ViewMsg_AccessibilitySetTextSelection,
+                    int /* object id */,
+                    int /* New start offset */,
+                    int /* New end offset */)
+
 // Tells the render view that a ViewHostMsg_AccessibilityNotifications
 // message was processed and it can send addition notifications.
 IPC_MESSAGE_ROUTED0(ViewMsg_AccessibilityNotifications_ACK)
 
 // Reply to ViewHostMsg_OpenChannelToPpapiBroker
 // Tells the renderer that the channel to the broker has been created.
 IPC_MESSAGE_ROUTED3(ViewMsg_PpapiBrokerChannelCreated,
                     int /* request_id */,
                     base::ProcessHandle /* broker_process_handle */,
                     IPC::ChannelHandle /* handle */)
@@ skipping 809 matching lines @@
                      media::MediaLogEvent /* event */)
 
 // Requests to lock the mouse. Will result in a ViewMsg_LockMouse_ACK message
 // being sent back.
 IPC_MESSAGE_ROUTED0(ViewHostMsg_LockMouse)
 
 // Requests to unlock the mouse. A ViewMsg_MouseLockLost message will be sent
 // whenever the mouse is unlocked (which may or may not be caused by
 // ViewHostMsg_UnlockMouse).
 IPC_MESSAGE_ROUTED0(ViewHostMsg_UnlockMouse)