Implement HTML selects as native Cocoa controls for Chrome

chrome/common/render_messages_internal.h

 // Copyright (c) 2009 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 1319 matching lines @@
   // returned.  The handle can be used for sending messages to the extension.
   IPC_SYNC_MESSAGE_CONTROL1_1(ViewHostMsg_OpenChannelToExtension,
                               std::string /* extension_id */,
                               int /* port_id */)
 
   // Send a message to an extension process.  The handle is the value returned
   // by ViewHostMsg_OpenChannelToExtension.
   IPC_MESSAGE_CONTROL2(ViewHostMsg_ExtensionPostMessage,
                        int /* port_id */,
                        std::string /* message */)
+
+  // Message to show a popup menu using native cocoa controls (Mac only).
+  IPC_MESSAGE_ROUTED1(ViewHostMsg_ShowPopup,
+                      ViewHostMsg_ShowPopup_Params)
+
 IPC_END_MESSAGES(ViewHost)