scheduler: Move the Blink scheduler into Blink

components/scheduler/base/enqueue_order.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/base/enqueue_order.h"
-
-namespace scheduler {
-namespace internal {
-
-EnqueueOrderGenerator::EnqueueOrderGenerator() : enqueue_order_(0) {}
-
-EnqueueOrderGenerator::~EnqueueOrderGenerator() {}
-
-EnqueueOrder EnqueueOrderGenerator::GenerateNext() {
-  base::AutoLock lock(lock_);
-  return enqueue_order_++;
-}
-
-}  // namespace internal
-}  // namespace scheduler