[SyncFS] Add TaskLogger and wire up it.

chrome/browser/sync_file_system/drive_backend/sync_engine.h

Index: chrome/browser/sync_file_system/drive_backend/sync_engine.h
diff --git a/chrome/browser/sync_file_system/drive_backend/sync_engine.h b/chrome/browser/sync_file_system/drive_backend/sync_engine.h
index 9f9329146e52b45593fd70296e47a1895a1b1e28..45bf4b344f379ca6fd622d7161cf8c0958ba235b 100644
--- a/chrome/browser/sync_file_system/drive_backend/sync_engine.h
+++ b/chrome/browser/sync_file_system/drive_backend/sync_engine.h
@@ -59,13 +59,15 @@ class SyncEngine : public RemoteFileSyncService,
   typedef Observer SyncServiceObserver;
 
   static scoped_ptr<SyncEngine> CreateForBrowserContext(
-      content::BrowserContext* context);
+      content::BrowserContext* context,
+      TaskLogger* task_logger);
   static void AppendDependsOnFactories(
       std::set<BrowserContextKeyedServiceFactory*>* factories);
 
   virtual ~SyncEngine();
 
   void Initialize(const base::FilePath& base_dir,
+                  TaskLogger* task_logger,
                   base::SequencedTaskRunner* file_task_runner,
                   leveldb::Env* env_override);