Add metadata to content::PasswordForm to keep track of the password usage.

chrome/browser/password_manager/password_form_manager.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/password_manager/password_form_manager.h"
 
 #include <algorithm>
 
 #include "base/metrics/histogram.h"
 #include "base/string_util.h"
@@ skipping 430 matching lines @@
   DCHECK(!IsNewLogin() && pending_credentials_.preferred);
   DCHECK(!profile_->IsOffTheRecord());
 
   PasswordStore* password_store = PasswordStoreFactory::GetForProfile(
       profile_, Profile::IMPLICIT_ACCESS);
   if (!password_store) {
     NOTREACHED();
     return;
   }
 
+  // Update metadata.
+  ++pending_credentials_.times_used;
+
   UpdatePreferredLoginState(password_store);
 
   // Update the new preferred login.
   // Note origin.spec().length > signon_realm.length implies the origin has a
   // path, since signon_realm is a prefix of origin for HTML password forms.
   if ((observed_form_.scheme == PasswordForm::SCHEME_HTML) &&
       (observed_form_.origin.spec().length() >
        observed_form_.signon_realm.length()) &&
       (observed_form_.signon_realm == pending_credentials_.origin.spec())) {
     // The user logged in successfully with one of our autofilled logins on a
@@ skipping 72 matching lines @@
 
 void PasswordFormManager::SubmitFailed() {
   submit_result_ = kSubmitResultFailed;
 }
 
 void PasswordFormManager::SendNotBlacklistedToRenderer() {
   content::RenderViewHost* host = web_contents_->GetRenderViewHost();
   host->Send(new AutofillMsg_FormNotBlacklisted(host->GetRoutingID(),
                                                  observed_form_));
 }