Record PendingTaskCount when a backgrounded renderer is suspended.

third_party/WebKit/Source/platform/scheduler/child/scheduler_helper.cc

 // Copyright 2015 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 "platform/scheduler/child/scheduler_helper.h"
 
 #include "base/time/default_tick_clock.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "platform/scheduler/base/task_queue_impl.h"
@@ skipping 50 matching lines @@
 
 scoped_refptr<TaskQueue> SchedulerHelper::DefaultTaskRunner() {
   CheckOnValidThread();
   return default_task_runner_;
 }
 
 scoped_refptr<TaskQueue> SchedulerHelper::ControlTaskRunner() {
   return control_task_runner_;
 }
 
+size_t SchedulerHelper::GetNumberOfPendingTasks() const {
+  return task_queue_manager_->GetNumberOfPendingTasks();
+}
 
 void SchedulerHelper::SetWorkBatchSizeForTesting(size_t work_batch_size) {
   CheckOnValidThread();
   DCHECK(task_queue_manager_.get());
   task_queue_manager_->SetWorkBatchSize(work_batch_size);
 }
 
 TaskQueueManager* SchedulerHelper::GetTaskQueueManagerForTesting() {
   CheckOnValidThread();
   return task_queue_manager_.get();
@@ skipping 75 matching lines @@
 }
 
 TaskQueue* SchedulerHelper::CurrentlyExecutingTaskQueue() const {
   if (!task_queue_manager_)
     return nullptr;
   return task_queue_manager_->currently_executing_task_queue();
 }
 
 }  // namespace scheduler
 }  // namespace blink