[Sync] Move snapshot cache from SBHI to PSS.

components/sync/driver/glue/sync_backend_host_impl.cc

 // 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.
 
 #include "components/sync/driver/glue/sync_backend_host_impl.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 232 matching lines @@
 
 UserShare* SyncBackendHostImpl::GetUserShare() const {
   return core_->sync_manager()->GetUserShare();
 }
 
 SyncBackendHostImpl::Status SyncBackendHostImpl::GetDetailedStatus() {
   DCHECK(initialized());
   return core_->sync_manager()->GetDetailedStatus();
 }
 
-SyncCycleSnapshot SyncBackendHostImpl::GetLastCycleSnapshot() const {
-  return last_snapshot_;
-}
-
 bool SyncBackendHostImpl::HasUnsyncedItems() const {
   DCHECK(initialized());
   return core_->sync_manager()->HasUnsyncedItems();
 }
 
 bool SyncBackendHostImpl::IsNigoriEnabled() const {
   return registrar_ && registrar_->IsNigoriEnabled();
 }
 
 PassphraseType SyncBackendHostImpl::GetPassphraseType() const {
@@ skipping 110 matching lines @@
   DCHECK(thread_checker_.CalledOnValidThread());
   host_->OnEngineInitialized(ModelTypeSet(), WeakHandle<JsBackend>(),
                              WeakHandle<DataTypeDebugInfoListener>(), "",
                              false);
 }
 
 void SyncBackendHostImpl::HandleSyncCycleCompletedOnFrontendLoop(
     const SyncCycleSnapshot& snapshot) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
-  last_snapshot_ = snapshot;
-
-  SDVLOG(1) << "Got snapshot " << snapshot.ToString();
-
-  if (!snapshot.poll_finish_time().is_null())
-    sync_prefs_->SetLastPollTime(snapshot.poll_finish_time());
-
   // Process any changes to the datatypes we're syncing.
   // TODO(sync): add support for removing types.
-  if (initialized())
+  if (initialized()) {
     AddExperimentalTypes();
-
-  if (initialized())
-    host_->OnSyncCycleCompleted();
+    host_->OnSyncCycleCompleted(snapshot);
+  }
 }
 
 void SyncBackendHostImpl::RetryConfigurationOnFrontendLoop(
     const base::Closure& retry_callback) {
   SDVLOG(1) << "Failed to complete configuration, informing of retry.";
   retry_callback.Run();
 }
 
 void SyncBackendHostImpl::PersistEncryptionBootstrapToken(
     const std::string& token,
@@ skipping 158 matching lines @@
     const SyncManager::ClearServerDataCallback& frontend_callback) {
   DCHECK(thread_checker_.CalledOnValidThread());
   frontend_callback.Run();
 }
 
 }  // namespace syncer
 
 #undef SDVLOG
 
 #undef SLOG