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

chrome/browser/renderer_host/render_view_host.cc

Index: chrome/browser/renderer_host/render_view_host.cc
===================================================================
--- chrome/browser/renderer_host/render_view_host.cc	(revision 17847)
+++ chrome/browser/renderer_host/render_view_host.cc	(working copy)
@@ -759,6 +759,8 @@
                         OnMsgDOMUISend)
     IPC_MESSAGE_HANDLER(ViewHostMsg_ForwardMessageToExternalHost,
                         OnMsgForwardMessageToExternalHost)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_DocumentLoadedInFrame,
+                        OnMsgDocumentLoadedInFrame)
     IPC_MESSAGE_HANDLER(ViewHostMsg_GoToEntryAtOffset,
                         OnMsgGoToEntryAtOffset)
     IPC_MESSAGE_HANDLER(ViewHostMsg_SetTooltipText, OnMsgSetTooltipText)
@@ -1136,6 +1138,10 @@
   delegate_->ProcessExternalHostMessage(message, origin, target);
 }
 
+void RenderViewHost::OnMsgDocumentLoadedInFrame() {
+  delegate_->DocumentLoadedInFrame();
+}
+
 void RenderViewHost::DisassociateFromPopupCount() {
   Send(new ViewMsg_DisassociateFromPopupCount(routing_id()));
 }