[SyncFS] Add TaskLogger and wire up it.

chrome/browser/sync_file_system/drive_backend/sync_worker.cc

Index: chrome/browser/sync_file_system/drive_backend/sync_worker.cc
diff --git a/chrome/browser/sync_file_system/drive_backend/sync_worker.cc b/chrome/browser/sync_file_system/drive_backend/sync_worker.cc
index c2b7f87f6c4845a891b87221d8f8b1b5d3f5d626..32c1c030254103782abe88eb7276d6c10b109260 100644
--- a/chrome/browser/sync_file_system/drive_backend/sync_worker.cc
+++ b/chrome/browser/sync_file_system/drive_backend/sync_worker.cc
@@ -317,6 +317,14 @@ void SyncWorker::NotifyLastOperationStatus(
   }
 }
 
+void SyncWorker::RecordTaskLog(scoped_ptr<TaskLogger::TaskLog> task_log) {
+  context_->GetUITaskRunner()->PostTask(
+      FROM_HERE,
+      base::Bind(&TaskLogger::RecordLog,
+                 context_->GetTaskLogger(),
+                 base::Passed(&task_log)));
+}
+
 void SyncWorker::OnNotificationReceived() {
   if (service_state_ == REMOTE_SERVICE_TEMPORARY_UNAVAILABLE)
     UpdateServiceState(REMOTE_SERVICE_OK, "Got push notification for Drive.");