Plumb Task Scheduler Histograms to the Task Scheduler Internals Page

base/task_scheduler/task_scheduler_impl.cc

Index: base/task_scheduler/task_scheduler_impl.cc
diff --git a/base/task_scheduler/task_scheduler_impl.cc b/base/task_scheduler/task_scheduler_impl.cc
index 4a1feb13ef3103405dc2c8a87b6f1caccb9f4a48..3c8995cd885d8242758d63e173baf336d08b6c7b 100644
--- a/base/task_scheduler/task_scheduler_impl.cc
+++ b/base/task_scheduler/task_scheduler_impl.cc
@@ -9,6 +9,7 @@
 #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"
@@ -51,6 +52,14 @@ scoped_refptr<TaskRunner> TaskSchedulerImpl::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();