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

sync/sessions/sync_session_context.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 "sync/sessions/sync_session_context.h"
 
 #include "sync/sessions/debug_info_getter.h"
 #include "sync/util/extensions_activity.h"
 
 namespace syncer {
@@ skipping 14 matching lines @@
       extensions_activity_(extensions_activity),
       notifications_enabled_(false),
       max_commit_batch_size_(kDefaultMaxCommitBatchSize),
       debug_info_getter_(debug_info_getter),
       model_type_registry_(model_type_registry),
       keystore_encryption_enabled_(keystore_encryption_enabled),
       invalidator_client_id_(invalidator_client_id),
       server_enabled_pre_commit_update_avoidance_(false),
       client_enabled_pre_commit_update_avoidance_(
           client_enabled_pre_commit_update_avoidance),
-      cookie_jar_mismatch_(false) {
+      cookie_jar_mismatch_(false),
+      cookie_jar_empty_(false) {
   std::vector<SyncEngineEventListener*>::const_iterator it;
   for (it = listeners.begin(); it != listeners.end(); ++it)
     listeners_.AddObserver(*it);
 }
 
 SyncSessionContext::~SyncSessionContext() {
 }
 
 ModelTypeSet SyncSessionContext::GetEnabledTypes() const {
   return model_type_registry_->GetEnabledTypes();
 }
 
 void SyncSessionContext::SetRoutingInfo(
     const ModelSafeRoutingInfo& routing_info) {
   model_type_registry_->SetEnabledDirectoryTypes(routing_info);
 }
 
 }  // namespace sessions
 }  // namespace syncer