Reland: [Sync] Record sync memory usage in histogram broken by datatypes

components/sync/driver/directory_data_type_controller.cc

 // Copyright (c) 2015 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/directory_data_type_controller.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
+#include "components/sync/base/data_type_histogram.h"
 #include "components/sync/driver/sync_service.h"
 #include "components/sync/engine/model_type_configurer.h"
 #include "components/sync/syncable/syncable_read_transaction.h"
 #include "components/sync/syncable/user_share.h"
 
 namespace syncer {
 
 DirectoryDataTypeController::DirectoryDataTypeController(
     ModelType type,
     const base::Closure& dump_stack,
@@ skipping 54 matching lines @@
       ->directory->CollectMetaHandleCounts(&num_entries_by_type,
                                            &num_to_delete_entries_by_type);
   syncer::StatusCounters counters;
   counters.num_entries_and_tombstones = num_entries_by_type[type()];
   counters.num_entries =
       num_entries_by_type[type()] - num_to_delete_entries_by_type[type()];
 
   callback.Run(type(), counters);
 }
 
+void DirectoryDataTypeController::RecordMemoryUsageHistogram() {
+  syncer::syncable::Directory* directory =
+      sync_client_->GetSyncService()->GetUserShare()->directory.get();
+  size_t memory_usage = directory->EstimateMemoryUsageByType(type());
+  SyncRecordMemoryKbHistogram(kModelTypeMemoryHistogramPrefix, type(),
+                              memory_usage);
+}
+
 // static
 std::unique_ptr<base::ListValue>
 DirectoryDataTypeController::GetAllNodesForTypeFromDirectory(
     ModelType type,
     syncable::Directory* directory) {
   DCHECK(directory);
   syncable::ReadTransaction trans(FROM_HERE, directory);
   return directory->GetNodeDetailsForType(&trans, type);
 }
 
 }  // namespace syncer