Consider an immediate redirect as machine-initiated and slow one as...

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 664 matching lines @@
   // render_messages.h.
   IPC_MESSAGE_ROUTED1(ViewHostMsg_FrameNavigate,
                       ViewHostMsg_FrameNavigate_Params)
 
   // Notifies the browser that we have session history information.
   // page_id: unique ID that allows us to distinguish between history entries.
   IPC_MESSAGE_ROUTED2(ViewHostMsg_UpdateState,
                       int32 /* page_id */,
                       std::string /* state */)
 
+  // Notifies the browser that a document has been loaded in a frame.
+  IPC_MESSAGE_ROUTED0(ViewHostMsg_DocumentLoadedInFrame)
+
   // Changes the title for the page in the UI when the page is navigated or the
   // title changes.
   // TODO(darin): use a UTF-8 string to reduce data size
   IPC_MESSAGE_ROUTED2(ViewHostMsg_UpdateTitle, int32, std::wstring)
 
   // Change the encoding name of the page in UI when the page has detected
   // proper encoding name.
   IPC_MESSAGE_ROUTED1(ViewHostMsg_UpdateEncoding,
                       std::wstring /* new encoding name */)
 
@@ skipping 727 matching lines @@
   // ExtensionUnpacker for details.
   IPC_MESSAGE_CONTROL1(UtilityHostMsg_UnpackExtension_Succeeded,
                        DictionaryValue /* manifest */)
 
   // Reply when the utility process has failed while unpacking an extension.
   // |error_message| is a user-displayable explanation of what went wrong.
   IPC_MESSAGE_CONTROL1(UtilityHostMsg_UnpackExtension_Failed,
                        std::string /* error_message, if any */)
 
 IPC_END_MESSAGES(ViewHost)