[SyncFS] Add TaskLogger and wire up it.

chrome/browser/sync_file_system/drive_backend/sync_engine_context.h

Index: chrome/browser/sync_file_system/drive_backend/sync_engine_context.h
diff --git a/chrome/browser/sync_file_system/drive_backend/sync_engine_context.h b/chrome/browser/sync_file_system/drive_backend/sync_engine_context.h
index c4e4a7e62757c510f03af5a3fce880b929210cd9..bdab8c1f96720de8e075ce993a5b6fc14f273d3c 100644
--- a/chrome/browser/sync_file_system/drive_backend/sync_engine_context.h
+++ b/chrome/browser/sync_file_system/drive_backend/sync_engine_context.h
@@ -23,6 +23,7 @@ class DriveUploaderInterface;
 namespace sync_file_system {
 
 class RemoteChangeProcessor;
+class TaskLogger;
 
 namespace drive_backend {
 
@@ -33,6 +34,7 @@ class SyncEngineContext {
   SyncEngineContext(
       scoped_ptr<drive::DriveServiceInterface> drive_service,
       scoped_ptr<drive::DriveUploaderInterface> drive_uploader,
+      TaskLogger* task_logger,
       base::SingleThreadTaskRunner* ui_task_runner,
       base::SequencedTaskRunner* worker_task_runner,
       base::SequencedTaskRunner* file_task_runner);
@@ -44,6 +46,7 @@ class SyncEngineContext {
 
   drive::DriveServiceInterface* GetDriveService();
   drive::DriveUploaderInterface* GetDriveUploader();
+  base::WeakPtr<TaskLogger> GetTaskLogger();
   MetadataDatabase* GetMetadataDatabase();
   RemoteChangeProcessor* GetRemoteChangeProcessor();
   base::SingleThreadTaskRunner* GetUITaskRunner();
@@ -55,7 +58,8 @@ class SyncEngineContext {
  private:
   scoped_ptr<drive::DriveServiceInterface> drive_service_;
   scoped_ptr<drive::DriveUploaderInterface> drive_uploader_;
-  RemoteChangeProcessor* remote_change_processor_;  // Do not own
+  base::WeakPtr<TaskLogger> task_logger_;
+  RemoteChangeProcessor* remote_change_processor_;  // Not owned.
 
   scoped_ptr<MetadataDatabase> metadata_database_;
   scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;