[scheduler] Use Finch to control background throttling.

third_party/WebKit/Source/platform/scheduler/renderer/task_queue_throttler.h

 // 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.
 
 #ifndef THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_THROTTLING_HELPER_H_
 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_THROTTLING_HELPER_H_
 
 #include <set>
 #include <unordered_map>
 
@@ skipping 184 matching lines @@
   void EnableThrottling();
 
   const ThrottledTimeDomain* time_domain() const { return time_domain_.get(); }
 
   static base::TimeTicks AlignedThrottledRunTime(
       base::TimeTicks unthrottled_runtime);
 
   const scoped_refptr<TaskQueue>& task_runner() const { return task_runner_; }
 
   // Returned object is owned by |TaskQueueThrottler|.
-  TimeBudgetPool* CreateTimeBudgetPool(const char* name);
+  TimeBudgetPool* CreateTimeBudgetPool(
+      const char* name,
+      base::Optional<base::TimeDelta> max_budget_level,
+      base::Optional<base::TimeDelta> max_throttling_duration);
 
   // Accounts for given task for cpu-based throttling needs.
   void OnTaskRunTimeReported(TaskQueue* task_queue,
                              base::TimeTicks start_time,
                              base::TimeTicks end_time);
 
   void AsValueInto(base::trace_event::TracedValue* state,
                    base::TimeTicks now) const;
 
  private:
@@ skipping 43 matching lines @@
   void MaybeDeleteQueueMetadata(TaskQueueMap::iterator it);
 
   TaskQueueMap queue_details_;
   base::Callback<void(TaskQueue*)> forward_immediate_work_callback_;
   scoped_refptr<TaskQueue> task_runner_;
   RendererSchedulerImpl* renderer_scheduler_;  // NOT OWNED
   base::TickClock* tick_clock_;                // NOT OWNED
   const char* tracing_category_;               // NOT OWNED
   std::unique_ptr<ThrottledTimeDomain> time_domain_;
 
-  base::Optional<base::TimeDelta> max_budget_level_;
-  base::Optional<base::TimeDelta> max_throttling_duration_;
-
   CancelableClosureHolder pump_throttled_tasks_closure_;
   base::Optional<base::TimeTicks> pending_pump_throttled_tasks_runtime_;
   bool allow_throttling_;
 
   std::unordered_map<TimeBudgetPool*, std::unique_ptr<TimeBudgetPool>>
       time_budget_pools_;
 
   base::WeakPtrFactory<TaskQueueThrottler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskQueueThrottler);
 };
 
 }  // namespace scheduler
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_THROTTLING_HELPER_H_