Add histograms for deletion of session cookies on startup.

content/browser/net/sqlite_persistent_cookie_store.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 "content/browser/net/sqlite_persistent_cookie_store.h"
 
 #include <list>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 1287 matching lines @@
   }
 }
 
 void SQLitePersistentCookieStore::Backend::SetForceKeepSessionState() {
   base::AutoLock locked(lock_);
   force_keep_session_state_ = true;
 }
 
 void SQLitePersistentCookieStore::Backend::DeleteSessionCookiesOnStartup() {
   DCHECK(background_task_runner_->RunsTasksOnCurrentThread());
+  base::Time start_time = base::Time::Now();
   if (!db_->Execute("DELETE FROM cookies WHERE persistent != 1"))
     LOG(WARNING) << "Unable to delete session cookies.";
+
+  UMA_HISTOGRAM_TIMES("Cookie.Startup.TimeSpentDeletingCookies",
+                      base::Time::Now() - start_time);
+  UMA_HISTOGRAM_COUNTS("Cookie.Startup.NumberOfCookiesDeleted",
+                       db_->GetLastChangeCount());
 }
 
 void SQLitePersistentCookieStore::Backend::PostBackgroundTask(
     const tracked_objects::Location& origin, const base::Closure& task) {
   if (!background_task_runner_->PostTask(origin, task)) {
     LOG(WARNING) << "Failed to post task from " << origin.ToString()
                  << " to background_task_runner_.";
   }
 }
 
@@ skipping 130 matching lines @@
         (config.session_cookie_mode ==
          CookieStoreConfig::RESTORED_SESSION_COOKIES)) {
       cookie_monster->SetPersistSessionCookies(true);
     }
   }
 
   return cookie_monster;
 }
 
 }  // namespace content