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

components/browser_sync/profile_sync_service.h

 // 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.
 
 #ifndef COMPONENTS_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 #define COMPONENTS_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 
 #include <memory>
 #include <set>
 #include <string>
@@ skipping 707 matching lines @@
   // Tell the sync server that this client has disabled sync.
   void RemoveClientFromServer() const;
 
   // Called when the system is under memory pressure.
   void OnMemoryPressure(
       base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
 
   // Check if previous shutdown is shutdown cleanly.
   void ReportPreviousSessionMemoryWarningCount();
 
+  // Estimates and records memory usage histograms per type.
+  void RecordMemoryUsageHistograms();
+
   // After user switches to custom passphrase encryption a set of steps needs to
   // be performed:
   //
   // - Download all latest updates from server (catch up configure).
   // - Clear user data on server.
   // - Clear directory so that data is merged from model types and encrypted.
   //
   // SyncServiceCrypto::BeginConfigureCatchUpBeforeClear() and the following two
   // functions perform these steps.
 
@@ skipping 158 matching lines @@
   base::WeakPtrFactory<ProfileSyncService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };
 
 bool ShouldShowActionOnUI(const syncer::SyncProtocolError& error);
 
 }  // namespace browser_sync
 
 #endif  // COMPONENTS_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_