[scheduler] Add TaskQueue::Observer

third_party/WebKit/Source/platform/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 "platform/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 "platform/scheduler/base/real_time_domain.h"
@@ skipping 92 matching lines @@
       base::TimeDelta::FromMilliseconds(kMinimumIdlePeriodDurationMillis)) {
     *next_long_idle_period_delay_out = long_idle_period_duration;
     if (!idle_queue_->HasPendingImmediateWork()) {
       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.
+    // If we can't start the idle period yet then try again after wake-up.
     *next_long_idle_period_delay_out = base::TimeDelta::FromMilliseconds(
         kRetryEnableLongIdlePeriodDelayMillis);
     return IdlePeriodState::NOT_IN_IDLE_PERIOD;
   }
 }
 
 bool IdleHelper::ShouldWaitForQuiescence() {
   helper_->CheckOnValidThread();
 
   if (required_quiescence_duration_before_long_idle_period_ ==
@@ skipping 379 matching lines @@
     case IdlePeriodState::IN_LONG_IDLE_PERIOD_PAUSED:
       return "in_long_idle_period_paused";
     default:
       NOTREACHED();
       return nullptr;
   }
 }
 
 }  // namespace scheduler
 }  // namespace blink