scheduler: Add an unthrottled per-frame task runner

components/scheduler/renderer/renderer_scheduler_impl.cc

 // Copyright 2014 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 "components/scheduler/renderer/renderer_scheduler_impl.h"
 
 #include "base/bind.h"
 #include "base/debug/stack_trace.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
@@ skipping 214 matching lines @@
       MainThreadOnly().current_policy.timer_queue_policy.priority);
   if (MainThreadOnly().current_policy.timer_queue_policy.time_domain_type ==
       TimeDomainType::THROTTLED) {
     throttling_helper_->IncreaseThrottleRefCount(timer_task_queue.get());
   }
   timer_task_queue->AddTaskObserver(
       &MainThreadOnly().timer_task_cost_estimator);
   return timer_task_queue;
 }
 
+scoped_refptr<TaskQueue> RendererSchedulerImpl::NewUnthrottledTaskRunner(
+    const char* name) {
+  helper_.CheckOnValidThread();
+  scoped_refptr<TaskQueue> unthrottled_task_queue(helper_.NewTaskQueue(
+      TaskQueue::Spec(name).SetShouldMonitorQuiescence(true)));
+  return unthrottled_task_queue;
+}
+
 std::unique_ptr<RenderWidgetSchedulingState>
 RendererSchedulerImpl::NewRenderWidgetSchedulingState() {
   return render_widget_scheduler_signals_.NewRenderWidgetSchedulingState();
 }
 
 void RendererSchedulerImpl::OnUnregisterTaskQueue(
     const scoped_refptr<TaskQueue>& task_queue) {
   if (throttling_helper_.get())
     throttling_helper_->UnregisterTaskQueue(task_queue.get());
 
@@ skipping 1164 matching lines @@
       return "idle";
     case v8::PERFORMANCE_LOAD:
       return "load";
     default:
       NOTREACHED();
       return nullptr;
   }
 }
 
 }  // namespace scheduler