Plumb Task Scheduler Histograms to the Task Scheduler Internals Page

base/task_scheduler/task_scheduler_impl.cc

 // 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.
 
 #include "base/task_scheduler/task_scheduler_impl.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/memory/ptr_util.h"
+#include "base/metrics/histogram_base.h"
 #include "base/task_scheduler/scheduler_worker_pool_params.h"
 #include "base/task_scheduler/sequence_sort_key.h"
 #include "base/task_scheduler/task.h"
 #include "base/time/time.h"
 
 namespace base {
 namespace internal {
 
 // static
 std::unique_ptr<TaskSchedulerImpl> TaskSchedulerImpl::Create(
@@ skipping 22 matching lines @@
       make_scoped_refptr(new Sequence), nullptr);
 }
 
 scoped_refptr<TaskRunner> TaskSchedulerImpl::CreateTaskRunnerWithTraits(
     const TaskTraits& traits,
     ExecutionMode execution_mode) {
   return GetWorkerPoolForTraits(traits)->CreateTaskRunnerWithTraits(
       traits, execution_mode);
 }
 
+std::vector<const HistogramBase*> TaskSchedulerImpl::GetHistograms() const {
+  std::vector<const HistogramBase*> histograms;
+  for (const auto& worker_pool : worker_pools_)
+    worker_pool->GetHistograms(&histograms);
+
+  return histograms;
+}
+
 void TaskSchedulerImpl::Shutdown() {
   // TODO(fdoray): Increase the priority of BACKGROUND tasks blocking shutdown.
   task_tracker_.Shutdown();
 }
 
 void TaskSchedulerImpl::FlushForTesting() {
   task_tracker_.Flush();
 }
 
 void TaskSchedulerImpl::JoinForTesting() {
@@ skipping 71 matching lines @@
   // in |sequence|.
   const TaskTraits traits =
       sequence->PeekTaskTraits().WithPriority(sort_key.priority());
 
   GetWorkerPoolForTraits(traits)->ReEnqueueSequence(std::move(sequence),
                                                     sort_key);
 }
 
 }  // namespace internal
 }  // namespace base