[Sync] Add histograms for cookie jar state on Sessions commit

components/browser_sync/browser/profile_sync_service.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 "components/browser_sync/browser/profile_sync_service.h"
 
 #include <stddef.h>
 #include <cstddef>
 #include <map>
 #include <utility>
@@ skipping 2107 matching lines @@
                             syncer::STOP_SOURCE_LIMIT);
   RequestStop(CLEAR_DATA);
 }
 
 void ProfileSyncService::OnGaiaAccountsInCookieUpdated(
     const std::vector<gaia::ListedAccount>& accounts,
     const GoogleServiceAuthError& error) {
   if (!IsBackendInitialized())
     return;
 
-  bool cookie_mismatch = true;
+  bool cookie_jar_mismatch = true;
+  bool cookie_jar_empty = accounts.size() == 0;
   std::string account_id = signin_->GetAccountIdToUse();
 
   // Iterate through list of accounts, looking for current sync account.
   for (const auto& account : accounts) {
     if (account.gaia_id == account_id) {
-      cookie_mismatch = false;
+      cookie_jar_mismatch = false;
       break;
     }
   }
 
-  DVLOG(1) << "Cookie jar mismatch: " << cookie_mismatch;
-  backend_->OnCookieJarChanged(cookie_mismatch);
+  DVLOG(1) << "Cookie jar mismatch: " << cookie_jar_mismatch;
+  DVLOG(1) << "Cookie jar empty: " << cookie_jar_empty;
+  backend_->OnCookieJarChanged(cookie_jar_mismatch, cookie_jar_empty);
 }
 
 void ProfileSyncService::AddObserver(
     sync_driver::SyncServiceObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void ProfileSyncService::RemoveObserver(
     sync_driver::SyncServiceObserver* observer) {
   observers_.RemoveObserver(observer);
@@ skipping 379 matching lines @@
 }
 
 std::string ProfileSyncService::unrecoverable_error_message() const {
   return unrecoverable_error_message_;
 }
 
 tracked_objects::Location ProfileSyncService::unrecoverable_error_location()
     const {
   return unrecoverable_error_location_;
 }