[Reland] Optimize blink scheduler with an intrusive heap

third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.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/base/task_queue_impl.h"
 
 #include "base/trace_event/blame_context.h"
 #include "platform/scheduler/base/task_queue_manager.h"
 #include "platform/scheduler/base/task_queue_manager_delegate.h"
 #include "platform/scheduler/base/time_domain.h"
@@ skipping 85 matching lines @@
 
 TaskQueueImpl::MainThreadOnly::MainThreadOnly(
     TaskQueueManager* task_queue_manager,
     TaskQueueImpl* task_queue,
     TimeDomain* time_domain)
     : task_queue_manager(task_queue_manager),
       time_domain(time_domain),
       delayed_work_queue(new WorkQueue(task_queue, "delayed")),
       immediate_work_queue(new WorkQueue(task_queue, "immediate")),
       set_index(0),
+      heap_index(0),
       is_enabled(true),
       blame_context(nullptr),
       current_fence(0) {}
 
 TaskQueueImpl::MainThreadOnly::~MainThreadOnly() {}
 
 void TaskQueueImpl::UnregisterTaskQueue() {
   base::AutoLock lock(any_thread_lock_);
   if (main_thread_only().time_domain)
     main_thread_only().time_domain->UnregisterQueue(this);
@@ skipping 580 matching lines @@
   state->SetBoolean("is_cancelled", task.task.IsCancelled());
   state->SetDouble(
       "delayed_run_time",
       (task.delayed_run_time - base::TimeTicks()).InMicroseconds() / 1000.0L);
   state->EndDictionary();
 }
 
 }  // namespace internal
 }  // namespace scheduler
 }  // namespace blink