[Sync] Move snapshot cache from SBHI to PSS.

components/sync/engine/sync_engine_host_stub.h

 // Copyright 2016 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_ENGINE_SYNC_ENGINE_HOST_STUB_H_
 #define COMPONENTS_SYNC_ENGINE_SYNC_ENGINE_HOST_STUB_H_
 
 #include <string>
 
 #include "components/sync/engine/sync_engine_host.h"
 
 namespace syncer {
 
 class SyncEngineHostStub : public SyncEngineHost {
  public:
   SyncEngineHostStub();
   ~SyncEngineHostStub() override;
 
   // SyncEngineHost implementation.
   void OnEngineInitialized(
       ModelTypeSet initial_types,
       const WeakHandle<JsBackend>& js_backend,
       const WeakHandle<DataTypeDebugInfoListener>& debug_info_listener,
       const std::string& cache_guid,
       bool success) override;
-  void OnSyncCycleCompleted() override;
+  void OnSyncCycleCompleted(const SyncCycleSnapshot& snapshot) override;
   void OnProtocolEvent(const ProtocolEvent& event) override;
   void OnDirectoryTypeCommitCounterUpdated(
       ModelType type,
       const CommitCounters& counters) override;
   void OnDirectoryTypeUpdateCounterUpdated(
       ModelType type,
       const UpdateCounters& counters) override;
   void OnDatatypeStatusCounterUpdated(ModelType type,
                                       const StatusCounters& counters) override;
   void OnConnectionStatusChange(ConnectionStatus status) override;
   void OnPassphraseRequired(
       PassphraseRequiredReason reason,
       const sync_pb::EncryptedData& pending_keys) override;
   void OnPassphraseAccepted() override;
   void OnEncryptedTypesChanged(ModelTypeSet encrypted_types,
                                bool encrypt_everything) override;
   void OnEncryptionComplete() override;
   void OnMigrationNeededForTypes(ModelTypeSet types) override;
   void OnExperimentsChanged(const Experiments& experiments) override;
   void OnActionableError(const SyncProtocolError& error) override;
   void OnLocalSetPassphraseEncryption(
       const SyncEncryptionHandler::NigoriState& nigori_state) override;
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_ENGINE_SYNC_ENGINE_HOST_STUB_H_