Land http://codereview.chromium.org/159067:

chrome/common/render_messages.h

 // Copyright (c) 2006-2009 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.
 
 #ifndef CHROME_COMMON_RENDER_MESSAGES_H_
 #define CHROME_COMMON_RENDER_MESSAGES_H_
 
 #include <string>
 #include <vector>
 #include <map>
 
 #include "base/basictypes.h"
 #include "base/gfx/native_widget_types.h"
 #include "base/ref_counted.h"
 #include "base/shared_memory.h"
 #include "chrome/browser/renderer_host/resource_handler.h"
 #include "chrome/common/common_param_traits.h"
 #include "chrome/common/css_colors.h"
 #include "chrome/common/filter_policy.h"
 #include "chrome/common/modal_dialog_event.h"
 #include "chrome/common/page_transition_types.h"
 #include "chrome/common/renderer_preferences.h"
 #include "chrome/common/transport_dib.h"
+#include "chrome/common/view_types.h"
 #include "chrome/common/webkit_param_traits.h"
 #include "googleurl/src/gurl.h"
 #include "ipc/ipc_message_utils.h"
 #include "media/audio/audio_output.h"
 #include "net/base/upload_data.h"
 #include "net/http/http_response_headers.h"
 #include "webkit/glue/autofill_form.h"
 #include "webkit/glue/context_menu.h"
 #include "webkit/glue/form_data.h"
 #include "webkit/glue/password_form.h"
@@ skipping 1118 matching lines @@
       ReadParam(m, iter, &p->form) &&
       ReadParam(m, iter, &p->file) &&
       ReadParam(m, iter, &p->submit) &&
       ReadParam(m, iter, &p->other_values);
   }
   static void Log(const param_type& p, std::wstring* l) {
     l->append(L"<ViewMsg_UploadFile_Params>");
   }
 };
 
-
-
 // Traits for webkit_glue::PasswordFormDomManager::FillData.
 template <>
 struct ParamTraits<webkit_glue::PasswordFormDomManager::FillData> {
   typedef webkit_glue::PasswordFormDomManager::FillData param_type;
   static void Write(Message* m, const param_type& p) {
     WriteParam(m, p.basic_data);
     WriteParam(m, p.additional_logins);
     WriteParam(m, p.wait_for_username);
   }
   static bool Read(const Message* m, void** iter, param_type* r) {
@@ skipping 819 matching lines @@
     l->append(L", ");
     LogParam(p.cookie, l);
     l->append(L", ");
     LogParam(p.expected_pages_count, l);
     l->append(L", ");
     LogParam(p.has_selection, l);
     l->append(L")");
   }
 };
 
+template <>
+struct SimilarTypeTraits<ViewType::Type> {
+  typedef int Type;
+};
 
 }  // namespace IPC
 
 
 #define MESSAGES_INTERNAL_FILE "chrome/common/render_messages_internal.h"
 #include "ipc/ipc_message_macros.h"
 
 #endif  // CHROME_COMMON_RENDER_MESSAGES_H_