Add a basic functionality to the force-saving menu item.

components/autofill/content/common/autofill_messages.h

 // Copyright 2013 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.
 
 // Multiply-included message file, hence no include guard.
 
 #include <string>
 #include <vector>
 
 #include "base/strings/string16.h"
@@ skipping 174 matching lines @@
 IPC_MESSAGE_ROUTED2(AutofillMsg_FillPasswordSuggestion,
                     base::string16 /* username */,
                     base::string16 /* password */)
 
 // Tells the renderer to preview the username and password with the given
 // values.
 IPC_MESSAGE_ROUTED2(AutofillMsg_PreviewPasswordSuggestion,
                     base::string16 /* username */,
                     base::string16 /* password */)
 
+// Tells the renderer to find the focused password form (assuming it exists).
+// Renderer is expected to respond with the message
+// |AutofillHostMsg_FocusedPasswordFormFound|.
+IPC_MESSAGE_ROUTED0(AutofillMsg_FindFocusedPasswordForm)
+
 // Tells the renderer that this password form is not blacklisted.  A form can
 // be blacklisted if a user chooses "never save passwords for this site".
 IPC_MESSAGE_ROUTED1(AutofillMsg_FormNotBlacklisted,
                     autofill::PasswordForm /* form checked */)
 
 // Sent when requestAutocomplete() finishes (either succesfully or with an
 // error). If it was a success, the renderer fills the form that requested
 // autocomplete with the |form_data| values input by the user. |message|
 // is printed to the console if non-empty.
 IPC_MESSAGE_ROUTED3(AutofillMsg_RequestAutocompleteResult,
@@ skipping 131 matching lines @@
     int /* key */,
     base::i18n::TextDirection /* text_direction */,
     base::string16 /* username typed by user */,
     int /* options bitmask of autofill::ShowPasswordSuggestionsOptions */,
     gfx::RectF /* input field bounds, window-relative */)
 
 // Inform browser of data list values for the curent field.
 IPC_MESSAGE_ROUTED2(AutofillHostMsg_SetDataList,
                     std::vector<base::string16> /* values */,
                     std::vector<base::string16> /* labels */)
+
+// Inform the browser which password form is currently focused, as a response
+// to the |AutofillMsg_FindFocusedPasswordForm| request. If no password form
+// is focused, the response will contain an empty |autofill::PasswordForm|.
+IPC_MESSAGE_ROUTED1(AutofillHostMsg_FocusedPasswordFormFound,
+                    autofill::PasswordForm)