[SyncFS] Add TaskLog tab on chrome://syncfs-internals

chrome/browser/sync_file_system/drive_backend/sync_task_manager.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/sync_file_system/drive_backend/sync_task_manager.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/sync_file_system/drive_backend/sync_task_token.h"
@@ skipping 306 matching lines @@
 
 void SyncTaskManager::PushPendingTask(
     const base::Closure& closure, Priority priority) {
   pending_tasks_.push(PendingTask(closure, priority, pending_task_seq_++));
 }
 
 void SyncTaskManager::RunTask(scoped_ptr<SyncTaskToken> token,
                               scoped_ptr<SyncTask> task) {
   DCHECK(!running_foreground_task_);
 
-  token->SetTaskLog(make_scoped_ptr(new TaskLogger::TaskLog));
-
   running_foreground_task_ = task.Pass();
   running_foreground_task_->RunPreflight(token.Pass());
 }
 
 void SyncTaskManager::StartNextTask() {
   if (!pending_backgrounding_task_.is_null()) {
     base::Closure closure = pending_backgrounding_task_;
     pending_backgrounding_task_.Reset();
     closure.Run();
     return;
   }
 
   if (!pending_tasks_.empty()) {
     base::Closure closure = pending_tasks_.top().task;
     pending_tasks_.pop();
     closure.Run();
     return;
   }
 
   if (client_)
     client_->MaybeScheduleNextTask();
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system