Focus following for the non-editable controls on web page in magnifier mode.

content/common/view_messages.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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/memory/shared_memory.h"
 #include "base/process/process.h"
 #include "base/strings/string16.h"
@@ skipping 1131 matching lines @@
 
 // Sent to update part of the view.  In response to this message, the host
 // generates a ViewMsg_UpdateRect_ACK message.
 IPC_MESSAGE_ROUTED1(ViewHostMsg_UpdateRect,
                     ViewHostMsg_UpdateRect_Params)
 
 IPC_MESSAGE_ROUTED0(ViewHostMsg_Focus)
 IPC_MESSAGE_ROUTED0(ViewHostMsg_Blur)
 
 // Message sent from renderer to the browser when focus changes inside the
-// webpage. The parameter says whether the newly focused element needs
+// webpage. The first parameter says whether the newly focused element needs
 // keyboard input (true for textfields, text areas and content editable divs).
-IPC_MESSAGE_ROUTED1(ViewHostMsg_FocusedNodeChanged,
-    bool /* is_editable_node */)
+// The second parameter is the node bounds relative to RenderWidgetHostView.
+IPC_MESSAGE_ROUTED2(ViewHostMsg_FocusedNodeChanged,
+                    bool /* is_editable_node */,
+                    gfx::Rect /* node_bounds */)
 
 IPC_MESSAGE_ROUTED1(ViewHostMsg_SetCursor, content::WebCursor)
 
 // Used to set a cookie. The cookie is set asynchronously, but will be
 // available to a subsequent ViewHostMsg_GetCookies request.
 IPC_MESSAGE_CONTROL4(ViewHostMsg_SetCookie,
                      int /* render_frame_id */,
                      GURL /* url */,
                      GURL /* first_party_for_cookies */,
                      std::string /* cookie */)
@@ skipping 470 matching lines @@
 // cached by the OS. Please see RenderMessageFilter::OnPreCacheFontCharacters
 // for details.
 IPC_SYNC_MESSAGE_CONTROL2_0(ViewHostMsg_PreCacheFontCharacters,
                             LOGFONT /* font_data */,
                             base::string16 /* characters */)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent ViewMsg, then ifdefs for platform specific ViewMsg, then platform
 // independent ViewHostMsg, then ifdefs for platform specific ViewHostMsg.