[scheduler] Use Finch to control background throttling.

third_party/WebKit/Source/platform/scheduler/renderer/task_queue_throttler.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/renderer/task_queue_throttler.h"
 
 #include <cstdint>
 
 #include "base/format_macros.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/optional.h"
 #include "base/strings/stringprintf.h"
 #include "platform/scheduler/base/real_time_domain.h"
 #include "platform/scheduler/child/scheduler_tqm_delegate.h"
 #include "platform/scheduler/renderer/renderer_scheduler_impl.h"
 #include "platform/scheduler/renderer/throttled_time_domain.h"
 #include "platform/scheduler/renderer/web_frame_scheduler_impl.h"
 #include "public/platform/WebFrameScheduler.h"
 
 namespace blink {
 namespace scheduler {
 
 namespace {
-constexpr base::TimeDelta kMaxBudgetLevel = base::TimeDelta::FromSeconds(1);
-constexpr base::TimeDelta kMaxThrottlingDuration =
-    base::TimeDelta::FromMinutes(1);
 
 base::Optional<base::TimeTicks> NextTaskRunTime(LazyNow* lazy_now,
                                                 TaskQueue* queue) {
   if (queue->HasPendingImmediateWork())
     return lazy_now->Now();
   return queue->GetNextScheduledWakeUp();
 }
 
 template <class T>
 T Min(const base::Optional<T>& optional, const T& value) {
@@ skipping 216 matching lines @@
 // TODO(altimin): Control max_budget_level and max_throttling_duration
 // from Finch.
 TaskQueueThrottler::TaskQueueThrottler(
     RendererSchedulerImpl* renderer_scheduler,
     const char* tracing_category)
     : task_runner_(renderer_scheduler->ControlTaskRunner()),
       renderer_scheduler_(renderer_scheduler),
       tick_clock_(renderer_scheduler->tick_clock()),
       tracing_category_(tracing_category),
       time_domain_(new ThrottledTimeDomain(this, tracing_category)),
-      max_budget_level_(kMaxBudgetLevel),
-      max_throttling_duration_(kMaxThrottlingDuration),
       allow_throttling_(true),
       weak_factory_(this) {
   pump_throttled_tasks_closure_.Reset(base::Bind(
       &TaskQueueThrottler::PumpThrottledTasks, weak_factory_.GetWeakPtr()));
   forward_immediate_work_callback_ =
       base::Bind(&TaskQueueThrottler::OnTimeDomainHasImmediateWork,
                  weak_factory_.GetWeakPtr());
 
   renderer_scheduler_->RegisterTimeDomain(time_domain_.get());
 }
@@ skipping 221 matching lines @@
 
   base::TimeDelta delay = pending_pump_throttled_tasks_runtime_.value() - now;
   TRACE_EVENT1(tracing_category_,
                "TaskQueueThrottler::MaybeSchedulePumpThrottledTasks",
                "delay_till_next_pump_ms", delay.InMilliseconds());
   task_runner_->PostDelayedTask(
       from_here, pump_throttled_tasks_closure_.callback(), delay);
 }
 
 TaskQueueThrottler::TimeBudgetPool* TaskQueueThrottler::CreateTimeBudgetPool(
-    const char* name) {
+    const char* name,
+    base::Optional<base::TimeDelta> max_budget_level,
+    base::Optional<base::TimeDelta> max_throttling_duration) {
   TimeBudgetPool* time_budget_pool =
-      new TimeBudgetPool(name, this, tick_clock_->NowTicks(), max_budget_level_,
-                         max_throttling_duration_);
+      new TimeBudgetPool(name, this, tick_clock_->NowTicks(), max_budget_level,
+                         max_throttling_duration);
   time_budget_pools_[time_budget_pool] = base::WrapUnique(time_budget_pool);
   return time_budget_pool;
 }
 
 void TaskQueueThrottler::OnTaskRunTimeReported(TaskQueue* task_queue,
                                                base::TimeTicks start_time,
                                                base::TimeTicks end_time) {
   if (!IsThrottled(task_queue))
     return;
 
@@ skipping 94 matching lines @@
 
     queue->SetQueueEnabled(false);
     queue->SetTimeDomain(time_domain_.get());
     MaybeSchedulePumpQueue(FROM_HERE, lazy_now.Now(), queue,
                            GetNextAllowedRunTime(lazy_now.Now(), queue));
   }
 }
 
 }  // namespace scheduler
 }  // namespace blink