[Sync] Implement MemoryDumpProvider.

components/sync/driver/glue/sync_backend_host_core.h

 // 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.
 
 #ifndef COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_CORE_H_
 #define COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_CORE_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/timer/timer.h"
+#include "base/trace_event/memory_dump_provider.h"
 #include "components/invalidation/public/invalidation.h"
 #include "components/sync/base/cancelation_signal.h"
 #include "components/sync/base/system_encryptor.h"
 #include "components/sync/driver/glue/sync_backend_host_impl.h"
 #include "components/sync/engine/cycle/type_debug_info_observer.h"
 #include "components/sync/engine/shutdown_reason.h"
 #include "components/sync/engine/sync_encryption_handler.h"
 #include "url/gurl.h"
 
 namespace syncer {
@@ skipping 54 matching lines @@
   DoConfigureSyncerTypes(const DoConfigureSyncerTypes& other);
   ~DoConfigureSyncerTypes();
   ModelTypeSet to_download;
   ModelTypeSet to_purge;
   ModelTypeSet to_journal;
   ModelTypeSet to_unapply;
 };
 
 class SyncBackendHostCore
     : public base::RefCountedThreadSafe<SyncBackendHostCore>,
+      public base::trace_event::MemoryDumpProvider,
       public SyncEncryptionHandler::Observer,
       public SyncManager::Observer,
       public TypeDebugInfoObserver {
  public:
   SyncBackendHostCore(const std::string& name,
                       const base::FilePath& sync_data_folder_path,
                       bool has_sync_setup_completed,
                       const base::WeakPtr<SyncBackendHostImpl>& backend);
 
+  // MemoryDumpProvider implementation.
+  bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
+                    base::trace_event::ProcessMemoryDump* pmd) override;
+
   // SyncManager::Observer implementation.  The Core just acts like an air
   // traffic controller here, forwarding incoming messages to appropriate
   // landing threads.
   void OnSyncCycleCompleted(const SyncCycleSnapshot& snapshot) override;
   void OnInitializationComplete(
       const WeakHandle<JsBackend>& js_backend,
       const WeakHandle<DataTypeDebugInfoListener>& debug_info_listener,
       bool success,
       ModelTypeSet restored_types) override;
   void OnConnectionStatusChange(ConnectionStatus status) override;
@@ skipping 204 matching lines @@
   std::map<ModelType, int64_t> last_invalidation_versions_;
 
   base::WeakPtrFactory<SyncBackendHostCore> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncBackendHostCore);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_DRIVER_GLUE_SYNC_BACKEND_HOST_CORE_H_