Move blink scheduler implementation into a component

components/scheduler/child/prioritizing_task_queue_selector.h

 // Copyright 2014 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.
 
-#ifndef CONTENT_CHILD_SCHEDULER_PRIORITIZING_TASK_QUEUE_SELECTOR_H_
-#define CONTENT_CHILD_SCHEDULER_PRIORITIZING_TASK_QUEUE_SELECTOR_H_
+#ifndef COMPONENTS_SCHEDULER_CHILD_PRIORITIZING_TASK_QUEUE_SELECTOR_H_
+#define COMPONENTS_SCHEDULER_CHILD_PRIORITIZING_TASK_QUEUE_SELECTOR_H_
 
 #include <set>
 
 #include "base/compiler_specific.h"
 #include "base/threading/thread_checker.h"
-#include "content/child/scheduler/task_queue_selector.h"
-#include "content/common/content_export.h"
+#include "components/scheduler/child/task_queue_selector.h"
+#include "components/scheduler/scheduler_export.h"
 
-namespace content {
+namespace scheduler {
 
 // A PrioritizingTaskQueueSelector is a TaskQueueSelector which is used by the
 // SchedulerHelper to enable prioritization of particular task queues.
-class CONTENT_EXPORT PrioritizingTaskQueueSelector
+class SCHEDULER_EXPORT PrioritizingTaskQueueSelector
     : NON_EXPORTED_BASE(public TaskQueueSelector) {
  public:
   enum QueuePriority {
     // Queues with control priority will run before any other queue, and will
     // explicitly starve other queues. Typically this should only be used for
     // private queues which perform control operations.
     CONTROL_PRIORITY,
     // Queues with high priority will be selected preferentially over normal or
     // best effort queues. The selector will ensure that high priority queues
     // cannot completely starve normal priority queues.
@@ skipping 66 matching lines @@
   static const size_t kMaxStarvationTasks = 5;
 
   base::ThreadChecker main_thread_checker_;
   std::vector<const base::TaskQueue*> work_queues_;
   std::set<size_t> queue_priorities_[QUEUE_PRIORITY_COUNT];
   size_t starvation_count_;
   Observer* task_queue_selector_observer_;  // NOT OWNED
   DISALLOW_COPY_AND_ASSIGN(PrioritizingTaskQueueSelector);
 };
 
-}  // namespace content
+}  // namespace scheduler
 
-#endif  // CONTENT_CHILD_SCHEDULER_PRIORITIZING_TASK_QUEUE_SELECTOR_H_
+#endif  // COMPONENTS_SCHEDULER_CHILD_PRIORITIZING_TASK_QUEUE_SELECTOR_H_