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

components/autofill/content/renderer/password_autofill_agent.cc

Index: components/autofill/content/renderer/password_autofill_agent.cc
diff --git a/components/autofill/content/renderer/password_autofill_agent.cc b/components/autofill/content/renderer/password_autofill_agent.cc
index eb2e06dbe78683c9c03c13020eb30d85bad58718..e9aed41ac28f17333d37044b99b6d7cf1b29a7a6 100644
--- a/components/autofill/content/renderer/password_autofill_agent.cc
+++ b/components/autofill/content/renderer/password_autofill_agent.cc
@@ -967,6 +967,8 @@ bool PasswordAutofillAgent::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER(AutofillMsg_SetLoggingState, OnSetLoggingState)
     IPC_MESSAGE_HANDLER(AutofillMsg_AutofillUsernameDataReceived,
                         OnAutofillUsernameDataReceived)
+    IPC_MESSAGE_HANDLER(AutofillMsg_FindFocusedPasswordForm,
+                        OnFindFocusedPasswordForm)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -1241,6 +1243,25 @@ void PasswordAutofillAgent::OnAutofillUsernameDataReceived(
   form_predictions_ = predictions;
 }
 
+void PasswordAutofillAgent::OnFindFocusedPasswordForm() {
+  scoped_ptr<PasswordForm> password_form;
+
+  blink::WebElement element = render_frame()->GetFocusedElement();
+  if (!element.isNull() && element.hasHTMLTagName("input")) {
+    blink::WebInputElement input = element.to<blink::WebInputElement>();
+    if (input.isPasswordField() && !input.form().isNull()) {
+      password_form = CreatePasswordForm(
+          input.form(), &nonscript_modified_values_, &form_predictions_);
+    }
+  }
+
+  if (!password_form.get())
+    password_form.reset(new PasswordForm());

[Mike West, 2015/05/29 12:26:53]

Optional nit: I'd fold this into line 1247; that is, set it to an empty password
form, and replace it iff you find one focused on the page.

[msramek, 2015/05/29 12:38:55]

If the WebFormElement is ununderstandable to CreatePasswordForm(), it will
return a null scoped_ptr. So we would still need to check it here.

+
+  Send(new AutofillHostMsg_FocusedPasswordFormFound(
+      routing_id(), *password_form));
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // PasswordAutofillAgent, private: