[password autofill] Add stats on provisional save failures.

chrome/browser/password_manager/password_manager.h

 // 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.
 
 #ifndef CHROME_BROWSER_PASSWORD_MANAGER_PASSWORD_MANAGER_H_
 #define CHROME_BROWSER_PASSWORD_MANAGER_PASSWORD_MANAGER_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 71 matching lines @@
       const std::vector<content::PasswordForm>& visible_forms);
 
  protected:
   // Subclassed for unit tests.
   PasswordManager(content::WebContents* web_contents,
                   PasswordManagerDelegate* delegate);
 
  private:
   friend class content::WebContentsUserData<PasswordManager>;
 
+  enum ProvisionalSaveFailure {
+    SAVING_DISABLED,
+    EMPTY_PASSWORD,
+    NO_MATCHING_FORM,
+    MATCHING_NOT_COMPLETE,
+    FORM_BLACKLISTED,
+    INVALID_FORM,
+    AUTOCOMPLETE_OFF,
+    MAX_FAILURE_VALUE
+  };
+
+  // Log failure for UMA
+  void RecordFailure(ProvisionalSaveFailure failure);
+
   // Possibly set up FieldTrial for testing other possible usernames. This only
   // happens if there are other_possible_usernames to be shown and the
   // experiment hasn't already been initialized. We setup the experiment at
   // such a late time because this experiment will only affect a small number
   // of users so we want to include a larger fraction of these users than the
   // normal 10%.
   void PossiblyInitializeUsernamesExperiment(
       const content::PasswordFormMap& matches) const;
 
   // Returns true if we can show possible usernames to users in cases where
@@ skipping 37 matching lines @@
   BooleanPrefMember password_manager_enabled_;
 
   // Observers to be notified of LoginModel events.  This is mutable to allow
   // notification in const member functions.
   mutable ObserverList<LoginModelObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(PasswordManager);
 };
 
 #endif  // CHROME_BROWSER_PASSWORD_MANAGER_PASSWORD_MANAGER_H_