[Sync] Split UserEventService into interface and impl, add fake impl, add unit tests.

chrome/browser/ui/webui/sync_internals_message_handler.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 "chrome/browser/ui/webui/sync_internals_message_handler.h"
 
 #include <stdint.h>
 
 #include <utility>
 #include <vector>
@@ skipping 197 matching lines @@
       Value(base::FeatureList::IsEnabled(switches::kSyncUserEvents)));
 }
 
 void SyncInternalsMessageHandler::HandleWriteUserEvent(
     const base::ListValue* args) {
   DCHECK_EQ(2U, args->GetSize());
   AllowJavascript();
 
   Profile* profile = Profile::FromWebUI(web_ui());
   syncer::UserEventService* user_event_service =
-      browser_sync::UserEventServiceFactory::GetForProfile(
-          profile->GetOriginalProfile());
+      browser_sync::UserEventServiceFactory::GetForProfile(profile);
 
   sync_pb::UserEventSpecifics event_specifics;
   event_specifics.set_event_time_usec(StringAtIndexToInt64(args, 0));
   event_specifics.set_navigation_id(StringAtIndexToInt64(args, 1));
   user_event_service->RecordUserEvent(event_specifics);
 }
 
 void SyncInternalsMessageHandler::OnReceivedAllNodes(
     int request_id,
     std::unique_ptr<ListValue> nodes) {
@@ skipping 79 matching lines @@
     js_controller_->RemoveJsEventHandler(this);
     js_controller_ = nullptr;
     is_registered_ = false;
   }
 
   if (is_registered_for_counters_) {
     service->RemoveTypeDebugInfoObserver(this);
     is_registered_for_counters_ = false;
   }
 }