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 169 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 field, so that the password
+// can be saved.

[vabr (Chromium), 2015/05/28 19:41:23]

Perhaps rather than "so that the password can be saved" mention that the
renderer is expected to answer with
AutofillHostMsg_PasswordFormForceSaveRequested.

The current formulation makes it unclear what else needs to be done to save the
password, and saving the password is not a part of the expected renderer
response.

[msramek, 2015/05/28 20:28:28]

Done.

+IPC_MESSAGE_ROUTED0(AutofillMsg_ForceSavePassword)

[vabr (Chromium), 2015/05/28 19:41:23]

Also, the name of the message, and the associated PasswordAutofillAgent handler,
is misleading. There is no (non-provisional) saving involved, just locating the
focussed form. Please reflect that in the name.

[msramek, 2015/05/28 20:28:28]

Done.

+
 // 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 contains the focused password element
+// and should be saved.
+IPC_MESSAGE_ROUTED1(AutofillHostMsg_PasswordFormForceSaveRequested,
+                    autofill::PasswordForm)