Use StringPiece for TaskScheduler name.

base/task_scheduler/task_scheduler.h

 // Copyright 2016 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.
 
 #ifndef BASE_TASK_SCHEDULER_TASK_SCHEDULER_H_
 #define BASE_TASK_SCHEDULER_TASK_SCHEDULER_H_
 
 #include <memory>
-#include <string>
 #include <vector>
 
 #include "base/base_export.h"
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/sequenced_task_runner.h"
 #include "base/single_thread_task_runner.h"
+#include "base/strings/string_piece.h"
 #include "base/task_runner.h"
 #include "base/task_scheduler/scheduler_worker_pool_params.h"
 #include "base/task_scheduler/task_traits.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 
 namespace gin {
 class V8Platform;
 }
 
@@ skipping 103 matching lines @@
   // The methods must not be called when TaskRunners created by the previous
   // TaskScheduler are still alive. The methods are not thread-safe; proper
   // synchronization is required to use the post_task.h API after registering a
   // new TaskScheduler.
 
 #if !defined(OS_NACL)
   // Creates and sets a task scheduler using default params. |name| is used to
   // label threads and histograms. It should identify the component that calls
   // this. CHECKs on failure. For tests, prefer base::test::ScopedTaskScheduler
   // (ensures isolation).
-  static void CreateAndSetSimpleTaskScheduler(const std::string& name);
+  static void CreateAndSetSimpleTaskScheduler(StringPiece name);
 #endif  // !defined(OS_NACL)
 
   // Creates and sets a task scheduler using custom params. |name| is used to
   // label threads and histograms. It should identify the component that creates
   // the TaskScheduler. |init_params| is used to initialize the worker pools.
   // CHECKs on failure. For tests, prefer base::test::ScopedTaskScheduler
   // (ensures isolation).
   //
   // Note: The names and priority hints in |init_params| are ignored (ref. TODO
   // to remove them).
-  static void CreateAndSetDefaultTaskScheduler(const std::string& name,
+  static void CreateAndSetDefaultTaskScheduler(StringPiece name,
                                                const InitParams& init_params);
 
   // Registers |task_scheduler| to handle tasks posted through the post_task.h
   // API for this process. For tests, prefer base::test::ScopedTaskScheduler
   // (ensures isolation).
   static void SetInstance(std::unique_ptr<TaskScheduler> task_scheduler);
 
   // Retrieve the TaskScheduler set via SetInstance() or
   // CreateAndSet(Simple|Default)TaskScheduler(). This should be used very
   // rarely; most users of TaskScheduler should use the post_task.h API. In
@@ skipping 18 matching lines @@
   // each process n/GetMaxConcurrentTasksWithTraitsDeprecated() items.
   //
   // TODO(fdoray): Remove this method. https://crbug.com/687264
   virtual int GetMaxConcurrentTasksWithTraitsDeprecated(
       const TaskTraits& traits) const = 0;
 };
 
 }  // namespace base
 
 #endif  // BASE_TASK_SCHEDULER_TASK_SCHEDULER_H_