Implement SyncableServices in TemplateURLService. Add related unittests.

chrome/browser/sync/api/sync_change.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/api/sync_change.h"
 
 SyncChange::SyncChange() : change_type_(ACTION_INVALID) {
 }
 
 SyncChange::SyncChange(SyncChangeType change_type, const SyncData& sync_data)
@@ skipping 24 matching lines @@
   return true;
 }
 
 SyncChange::SyncChangeType SyncChange::change_type() const {
   return change_type_;
 }
 
 SyncData SyncChange::sync_data() const {
   return sync_data_;
 }
+
+// static
+std::string SyncChange::ChangeTypeToString(SyncChangeType change_type) {
+  switch (change_type) {
+    case ACTION_INVALID:
+      return "ACTION_INVALID";
+    case ACTION_ADD:
+      return "ACTION_ADD";
+    case ACTION_UPDATE:
+      return "ACTION_UPDATE";
+    case ACTION_DELETE:
+      return "ACTION_DELETE";
+    default:
+      NOTREACHED();
+  }
+  return std::string();
+}