Remove worker pool names from TaskScheduler.TaskLatency.* histograms.

base/task_scheduler/scheduler_worker_pool_impl.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_SCHEDULER_WORKER_POOL_IMPL_H_
 #define BASE_TASK_SCHEDULER_SCHEDULER_WORKER_POOL_IMPL_H_
 
 #include <stddef.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
-#include "base/atomicops.h"
 #include "base/base_export.h"
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string_piece.h"
 #include "base/synchronization/atomic_flag.h"
 #include "base/synchronization/condition_variable.h"
 #include "base/task_scheduler/priority_queue.h"
 #include "base/task_scheduler/scheduler_lock.h"
 #include "base/task_scheduler/scheduler_worker.h"
 #include "base/task_scheduler/scheduler_worker_pool.h"
 #include "base/task_scheduler/scheduler_worker_pool_params.h"
 #include "base/task_scheduler/scheduler_worker_stack.h"
 #include "base/task_scheduler/sequence.h"
 #include "base/task_scheduler/task.h"
-#include "base/task_scheduler/task_traits.h"
 #include "base/threading/platform_thread.h"
 #include "base/time/time.h"
 
 namespace base {
 
 class HistogramBase;
+class TaskTraits;
 
 namespace internal {
 
 class DelayedTaskManager;
 class TaskTracker;
 
 // A pool of workers that run Tasks. This class is thread-safe.
 class BASE_EXPORT SchedulerWorkerPoolImpl : public SchedulerWorkerPool {
  public:
   // Callback invoked when a Sequence isn't empty after a worker pops a Task
@@ skipping 149 matching lines @@
   HistogramBase* const detach_duration_histogram_;
 
   // TaskScheduler.NumTasksBeforeDetach.[worker pool name] histogram.
   // Intentionally leaked.
   HistogramBase* const num_tasks_before_detach_histogram_;
 
   // TaskScheduler.NumTasksBetweenWaits.[worker pool name] histogram.
   // Intentionally leaked.
   HistogramBase* const num_tasks_between_waits_histogram_;
 
-  // TaskScheduler.TaskLatency.[worker pool name].[task priority] histograms.
-  // Indexed by task priority. Histograms are allocated on demand to reduce
-  // memory usage (some task priorities might never run in this
-  // SchedulerThreadPoolImpl). Intentionally leaked.
-  subtle::AtomicWord
-      task_latency_histograms_[static_cast<int>(TaskPriority::HIGHEST) + 1] =
-          {};
-
   TaskTracker* const task_tracker_;
   DelayedTaskManager* const delayed_task_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(SchedulerWorkerPoolImpl);
 };
 
 }  // namespace internal
 }  // namespace base
 
 #endif  // BASE_TASK_SCHEDULER_SCHEDULER_WORKER_POOL_IMPL_H_