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

components/sync_driver/glue/sync_backend_host_impl.cc

 // Copyright 2013 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/sync_driver/glue/sync_backend_host_impl.h"
 
 #include <map>
 #include <utility>
 #include <vector>
 
@@ skipping 838 matching lines @@
 }
 
 void SyncBackendHostImpl::ClearServerData(
     const syncer::SyncManager::ClearServerDataCallback& callback) {
   DCHECK(ui_thread_->BelongsToCurrentThread());
   registrar_->sync_thread()->task_runner()->PostTask(
       FROM_HERE, base::Bind(&SyncBackendHostCore::DoClearServerData,
                             core_.get(), callback));
 }
 
-void SyncBackendHostImpl::OnCookieJarChanged(bool account_mismatch) {
+void SyncBackendHostImpl::OnCookieJarChanged(bool account_mismatch,
+                                             bool empty_jar) {
   DCHECK(ui_thread_->BelongsToCurrentThread());
   registrar_->sync_thread()->task_runner()->PostTask(
       FROM_HERE, base::Bind(&SyncBackendHostCore::DoOnCookieJarChanged,
-                            core_.get(), account_mismatch));
+                            core_.get(), account_mismatch, empty_jar));
 }
 
 void SyncBackendHostImpl::ClearServerDataDoneOnFrontendLoop(
     const syncer::SyncManager::ClearServerDataCallback& frontend_callback) {
   DCHECK(ui_thread_->BelongsToCurrentThread());
   frontend_callback.Run();
 }
 
 }  // namespace browser_sync
 
 #undef SDVLOG
 
 #undef SLOG