A tricky fix for Issue 1845 (Take 2)....

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 511 matching lines @@
   // The browser sends this message when an extension API has a response.
   IPC_MESSAGE_ROUTED2(ViewMsg_ExtensionResponse,
                       int /* callback id */,
                       std::string /* response */)
 
   // Relay a message sent from a renderer to an extension process.  channel_id
   // is a handle that can be used for sending a response.
   IPC_MESSAGE_ROUTED2(ViewMsg_HandleExtensionMessage,
                       std::string /* message */,
                       int /* channel_id */)
+
+  // Changes the text direction of a selected input field.
+  // * direction (int)
+  //   Represents the new text direction.
+  //   Its possible values are listed below:
+  //     Value                      New Text Direction
+  //     WEB_TEXT_DIRECTION_DEFAULT NaturalWritingDirection ("inherit")
+  //     WEB_TEXT_DIRECTION_LTR     LeftToRightWritingDirection ("rtl")
+  //     WEB_TEXT_DIRECTION_RTL     RightToLeftWritingDirection ("ltr")
+  IPC_MESSAGE_ROUTED1(ViewMsg_SetTextDirection,
+                      int /* direction */)
 IPC_END_MESSAGES(View)
 
 
 //-----------------------------------------------------------------------------
 // WebContents messages
 // These are messages sent from the renderer to the browser process.
 
 IPC_BEGIN_MESSAGES(ViewHost)
   // Sent by the renderer when it is creating a new window.  The browser creates
   // a tab for it and responds with a ViewMsg_CreatingNew_ACK.  If route_id is
@@ skipping 712 matching lines @@
   IPC_SYNC_MESSAGE_CONTROL1_1(ViewHostMsg_OpenChannelToExtension,
                               std::string /* extension_id */,
                               int /* channel_id */)
 
   // Send a message to an extension process.  The handle is the value returned
   // by ViewHostMsg_OpenChannelToExtension.
   IPC_MESSAGE_CONTROL2(ViewHostMsg_ExtensionPostMessage,
                        int /* channel_id */,
                        std::string /* message */)
 IPC_END_MESSAGES(ViewHost)