[USS] Implement ApplySyncChanges and OnURLVisited/Modified/Deleted.

components/sync/model/recording_model_type_change_processor.cc

Index: components/sync/model/recording_model_type_change_processor.cc
diff --git a/components/sync/model/recording_model_type_change_processor.cc b/components/sync/model/recording_model_type_change_processor.cc
index a20e2990fec038531c42966a6d887bfe5e502604..8eb0f5d81991255d62e5ce1455cedf7549e11150 100644
--- a/components/sync/model/recording_model_type_change_processor.cc
+++ b/components/sync/model/recording_model_type_change_processor.cc
@@ -8,6 +8,7 @@
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
+#include "components/sync/model/fake_model_type_sync_bridge.h"
 #include "components/sync/model/metadata_batch.h"
 
 namespace syncer {
@@ -38,6 +39,8 @@ void RecordingModelTypeChangeProcessor::Put(
     const std::string& storage_key,
     std::unique_ptr<EntityData> entity_data,
     MetadataChangeList* metadata_changes) {
+  if (entity_data->modification_time.is_null())
+    entity_data->modification_time = base::Time::Now();
   put_multimap_.insert(std::make_pair(storage_key, std::move(entity_data)));
 }
 
@@ -47,6 +50,19 @@ void RecordingModelTypeChangeProcessor::Delete(
   delete_set_.insert(storage_key);
 }
 
+void RecordingModelTypeChangeProcessor::UpdateStorageKey(
+    const EntityData& entity_data,
+    const std::string& storage_key,
+    MetadataChangeList* metadata_change_list) {
+  update_multimap_.insert(std::make_pair(
+      storage_key, FakeModelTypeSyncBridge::CopyEntityData(entity_data)));
+}
+
+void RecordingModelTypeChangeProcessor::UntrackEntity(
+    const EntityData& entity_data) {
+  untrack_set_.insert(FakeModelTypeSyncBridge::CopyEntityData(entity_data));
+}
+
 void RecordingModelTypeChangeProcessor::ModelReadyToSync(
     std::unique_ptr<MetadataBatch> batch) {
   std::swap(metadata_, batch);