[scheduler] Do not call PumpThrottledTasks immediately when descheduled

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"
@@ skipping 467 matching lines @@
 }
 
 void TaskQueueThrottler::MaybeSchedulePumpThrottledTasks(
     const tracked_objects::Location& from_here,
     base::TimeTicks now,
     base::TimeTicks unaligned_runtime) {
   if (!allow_throttling_)
     return;
 
   base::TimeTicks runtime =
-      std::max(now, AlignedThrottledRunTime(unaligned_runtime));
+      AlignedThrottledRunTime(std::max(now, unaligned_runtime));
+  DCHECK_LE(now, runtime);
 
   // If there is a pending call to PumpThrottledTasks and it's sooner than
   // |runtime| then return.
   if (pending_pump_throttled_tasks_runtime_ &&
       runtime >= pending_pump_throttled_tasks_runtime_.value()) {
     return;
   }
 
   pending_pump_throttled_tasks_runtime_ = runtime;
 
@@ skipping 140 matching lines @@
     queue->SetTimeDomain(time_domain_.get());
     MaybeSchedulePumpQueue(FROM_HERE, lazy_now.Now(), queue,
                            GetNextAllowedRunTime(lazy_now.Now(), queue));
   }
 
   TRACE_EVENT0(tracing_category_, "TaskQueueThrottler_EnableThrottling");
 }
 
 }  // namespace scheduler
 }  // namespace blink