[Sync] Add a simple UI to sync-internals to create UserEvents.

chrome/browser/ui/webui/sync_internals_message_handler_unittest.cc

 // Copyright 2015 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/ui/webui/sync_internals_message_handler.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/command_line.h"
@@ skipping 167 matching lines @@
  private:
   SyncService* sync_service() { return test_sync_service_.get(); }
 
   content::TestBrowserThreadBundle thread_bundle_;
   TestingProfile profile_;
   content::TestWebUI web_ui_;
   scoped_refptr<content::SiteInstance> site_instance_;
   std::unique_ptr<content::WebContents> web_contents_;
   std::unique_ptr<TestSyncService> test_sync_service_;
   std::unique_ptr<TestableSyncInternalsMessageHandler> handler_;
-
   int about_sync_data_delegate_call_count_ = 0;
   SyncService* last_delegate_sync_service_ = nullptr;
 };
 
 TEST_F(SyncInternalsMessageHandlerTest, AddRemoveObservers) {
   ListValue empty_list;
 
   EXPECT_EQ(0, test_sync_service()->add_observer_count());
   handler()->HandleRegisterForEvents(&empty_list);
   EXPECT_EQ(1, test_sync_service()->add_observer_count());
@@ skipping 106 matching lines @@
   ResetSyncService();
 
   handler()->AllowJavascriptForTesting();
   handler()->OnStateChanged(nullptr);
   EXPECT_EQ(1, about_sync_data_delegate_call_count());
   EXPECT_EQ(nullptr, last_delegate_sync_service());
   ValidateAboutInfoCall();
 }
 
 }  // namespace