[WIP][tracing] Add memory dump provider for sync Directory

sync/internal_api/sync_manager_impl.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/internal_api/sync_manager_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <string>
 #include <utility>
@@ skipping 902 matching lines @@
   } else {
     scheduler_->ScheduleLocalRefreshRequest(
         types, FROM_HERE);
   }
 }
 
 SyncStatus SyncManagerImpl::GetDetailedStatus() const {
   return allstatus_.status();
 }
 
+void SyncManagerImpl::OnMemoryDump(base::trace_event::ProcessMemoryDump* pmd) {
+  directory()->OnMemoryDump(pmd);
+}
+
 void SyncManagerImpl::SaveChanges() {
   directory()->SaveChanges();
 }
 
 UserShare* SyncManagerImpl::GetUserShare() {
   DCHECK(initialized_);
   return &share_;
 }
 
 std::unique_ptr<syncer_v2::ModelTypeConnector>
@@ skipping 94 matching lines @@
 }
 
 void SyncManagerImpl::OnCookieJarChanged(bool account_mismatch,
                                          bool empty_jar) {
   DCHECK(thread_checker_.CalledOnValidThread());
   session_context_->set_cookie_jar_mismatch(account_mismatch);
   session_context_->set_cookie_jar_empty(empty_jar);
 }
 
 }  // namespace syncer