[Sync] Split DirectoryChangeListener for thread-safety

chrome/browser/sync/js_directory_change_listener.cc

-// Copyright (c) 2011 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 "chrome/browser/sync/js_directory_change_listener.h"
-
-#include "base/logging.h"
-#include "base/values.h"
-#include "chrome/browser/sync/js_event_details.h"
-#include "chrome/browser/sync/js_event_router.h"
-
-namespace browser_sync {
-
-JsDirectoryChangeListener::JsDirectoryChangeListener(
-    JsEventRouter* parent_router)
-    : parent_router_(parent_router) {
-  DCHECK(parent_router_);
-}
-
-JsDirectoryChangeListener::~JsDirectoryChangeListener() {}
-
-void JsDirectoryChangeListener::HandleCalculateChangesChangeEventFromSyncApi(
-    const syncable::OriginalEntries& originals,
-    const syncable::WriterTag& writer,
-    syncable::BaseTransaction* trans) {
-  DictionaryValue details;
-  details.Set("originals", syncable::OriginalEntriesToValue(originals));
-  details.SetString("writer", syncable::WriterTagToString(writer));
-  parent_router_->RouteJsEvent("handleCalculateChangesChangeEventFromSyncApi",
-                               JsEventDetails(&details));
-}
-
-void JsDirectoryChangeListener::HandleCalculateChangesChangeEventFromSyncer(
-    const syncable::OriginalEntries& originals,
-    const syncable::WriterTag& writer,
-    syncable::BaseTransaction* trans) {
-  DictionaryValue details;
-  details.Set("originals", syncable::OriginalEntriesToValue(originals));
-  details.SetString("writer", syncable::WriterTagToString(writer));
-  parent_router_->RouteJsEvent("handleCalculateChangesChangeEventFromSyncer",
-                               JsEventDetails(&details));
-}
-
-syncable::ModelTypeBitSet
-    JsDirectoryChangeListener::HandleTransactionEndingChangeEvent(
-        syncable::BaseTransaction* trans) {
-  parent_router_->RouteJsEvent("handleTransactionEndingChangeEvent",
-                               JsEventDetails());
-  return syncable::ModelTypeBitSet();
-}
-
-void JsDirectoryChangeListener::HandleTransactionCompleteChangeEvent(
-    const syncable::ModelTypeBitSet& models_with_changes) {
-  DictionaryValue details;
-  details.Set("modelsWithChanges",
-              syncable::ModelTypeBitSetToValue(models_with_changes));
-  parent_router_->RouteJsEvent("handleTransactionCompleteChangeEvent",
-                               JsEventDetails(&details));
-}
-
-}  // namespace browser_sync