Move throttling of background timers into the renderer scheduler

components/scheduler/child/idle_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 "components/scheduler/child/idle_helper.h"
 
 #include "base/time/time.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "components/scheduler/base/real_time_domain.h"
@@ skipping 75 matching lines @@
     // Limit the idle period duration to be before the next pending task.
     long_idle_period_duration = std::min(next_pending_delayed_task - now,
                                          max_long_idle_period_duration);
   } else {
     long_idle_period_duration = max_long_idle_period_duration;
   }
 
   if (long_idle_period_duration >=
       base::TimeDelta::FromMilliseconds(kMinimumIdlePeriodDurationMillis)) {
     *next_long_idle_period_delay_out = long_idle_period_duration;
-    if (idle_queue_->IsQueueEmpty()) {
+    if (!idle_queue_->HasPendingImmediateTask()) {
       return IdlePeriodState::IN_LONG_IDLE_PERIOD_PAUSED;
     } else if (long_idle_period_duration == max_long_idle_period_duration) {
       return IdlePeriodState::IN_LONG_IDLE_PERIOD_WITH_MAX_DEADLINE;
     } else {
       return IdlePeriodState::IN_LONG_IDLE_PERIOD;
     }
   } else {
     // If we can't start the idle period yet then try again after wakeup.
     *next_long_idle_period_delay_out = base::TimeDelta::FromMilliseconds(
         kRetryEnableLongIdlePeriodDelayMillis);
@@ skipping 368 matching lines @@
       return "in_long_idle_period_with_max_deadline";
     case IdlePeriodState::IN_LONG_IDLE_PERIOD_PAUSED:
       return "in_long_idle_period_paused";
     default:
       NOTREACHED();
       return nullptr;
   }
 }
 
 }  // namespace scheduler