AutoFill forms. We do this by responding to a message from WebKit which send...

chrome/common/render_messages_internal.h

Index: chrome/common/render_messages_internal.h
===================================================================
--- chrome/common/render_messages_internal.h	(revision 39310)
+++ chrome/common/render_messages_internal.h	(working copy)
@@ -627,6 +627,12 @@
                       std::vector<string16> /* suggestions */,
                       int /* index of default suggestion */)
 
+  // Reply to the ViewHostMsg_FillAutoFillFormData message with the
+  // AutoFill form data.
+  IPC_MESSAGE_ROUTED2(ViewMsg_AutoFillFormDataFilled,
+                      int /* id of the request message */,
+                      FormData /* form data */)
+
   // Sent by the Browser process to alert a window about whether a blocked
   // popup notification is visible. The renderer assumes every new window is a
   // blocked popup until notified otherwise.
@@ -1734,6 +1740,14 @@
                       int /* id of this message */,
                       webkit_glue::FormField /* the form field */)
 
+  // Instructs the browser to fill in the values for a form using AutoFill
+  // profile data.
+  IPC_MESSAGE_ROUTED4(ViewHostMsg_FillAutoFillFormData,
+                      int /* id of this message */,
+                      FormData /* the form  */,
+                      string16 /* profile name */,
+                      string16 /* profile label */)
+
   // Instructs the browser to remove the specified autofill-entry from the
   // database.
   IPC_MESSAGE_ROUTED2(ViewHostMsg_RemoveAutofillEntry,