[Sync] Add a sanity integration test for USS.

components/sync/test/fake_server/tombstone_entity.cc

 // Copyright 2014 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/test/fake_server/tombstone_entity.h"
 
 #include <string>
 
 #include "components/sync/base/model_type.h"
 #include "components/sync/protocol/sync.pb.h"
 #include "components/sync/test/fake_server/fake_server_entity.h"
 
 using std::string;
 
 using syncer::ModelType;
 
 namespace fake_server {
 
 TombstoneEntity::~TombstoneEntity() {}
 
 // static
-std::unique_ptr<FakeServerEntity> TombstoneEntity::Create(const string& id) {
+std::unique_ptr<FakeServerEntity> TombstoneEntity::Create(
+    const string& id,
+    const string& client_defined_unique_tag) {
   const ModelType model_type = GetModelTypeFromId(id);
   CHECK_NE(model_type, syncer::UNSPECIFIED) << "Invalid ID was given: " << id;
-  return std::unique_ptr<FakeServerEntity>(new TombstoneEntity(id, model_type));
+  return std::unique_ptr<FakeServerEntity>(
+      new TombstoneEntity(id, client_defined_unique_tag, model_type));
 }
 
-TombstoneEntity::TombstoneEntity(const string& id, const ModelType& model_type)
-    : FakeServerEntity(id, model_type, 0, string()) {
+TombstoneEntity::TombstoneEntity(const string& id,
+                                 const string& client_defined_unique_tag,
+                                 const ModelType& model_type)
+    : FakeServerEntity(id, client_defined_unique_tag, model_type, 0, string()) {
   sync_pb::EntitySpecifics specifics;
   AddDefaultFieldValue(model_type, &specifics);
   SetSpecifics(specifics);
 }
 
 bool TombstoneEntity::RequiresParentId() const {
   return false;
 }
 
 string TombstoneEntity::GetParentId() const {
   return string();
 }
 
 void TombstoneEntity::SerializeAsProto(sync_pb::SyncEntity* proto) const {
   FakeServerEntity::SerializeBaseProtoFields(proto);
 }
 
 bool TombstoneEntity::IsDeleted() const {
   return true;
 }
 
 }  // namespace fake_server