Move blink scheduler implementation into a component

components/scheduler/child/task_queue_manager.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_RENDERER_SCHEDULER_TASK_QUEUE_MANAGER_H_
 #define CONTENT_RENDERER_SCHEDULER_TASK_QUEUE_MANAGER_H_
 
 #include "base/atomic_sequence_num.h"
 #include "base/debug/task_annotator.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/pending_task.h"
 #include "base/single_thread_task_runner.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
-#include "content/child/scheduler/task_queue_selector.h"
-#include "content/child/scheduler/time_source.h"
-#include "content/common/content_export.h"
+#include "components/scheduler/child/task_queue_selector.h"
+#include "components/scheduler/child/time_source.h"
+#include "components/scheduler/scheduler_export.h"
 
 namespace base {
 namespace trace_event {
 class ConvertableToTraceFormat;
 class TracedValue;
 }
 }
 
-namespace content {
+namespace scheduler {
 namespace internal {
 class LazyNow;
 class TaskQueue;
 }
 class NestableSingleThreadTaskRunner;
 class TaskQueueSelector;
 class TimeSource;
 
 // The task queue manager provides N task queues and a selector interface for
 // choosing which task queue to service next. Each task queue consists of two
 // sub queues:
 //
 // 1. Incoming task queue. Tasks that are posted get immediately appended here.
 //    When a task is appended into an empty incoming queue, the task manager
 //    work function (DoWork) is scheduled to run on the main task runner.
 //
 // 2. Work queue. If a work queue is empty when DoWork() is entered, tasks from
 //    the incoming task queue (if any) are moved here. The work queues are
 //    registered with the selector as input to the scheduling decision.
 //
-class CONTENT_EXPORT TaskQueueManager
-    : public TaskQueueSelector::Observer {
+class SCHEDULER_EXPORT TaskQueueManager : public TaskQueueSelector::Observer {
  public:
   // Keep TaskQueue::PumpPolicyToString in sync with this enum.
   enum class PumpPolicy {
     // Tasks posted to an incoming queue with an AUTO pump policy will be
     // automatically scheduled for execution or transferred to the work queue
     // automatically.
     AUTO,
     // Tasks posted to an incoming queue with an AFTER_WAKEUP pump policy
     // will be scheduled for execution or transferred to the work queue
     // automatically but only after another queue has executed a task.
@@ skipping 153 matching lines @@
   ObserverList<base::MessageLoop::TaskObserver> task_observers_;
 
   const char* disabled_by_default_tracing_category_;
 
   scoped_refptr<DeletionSentinel> deletion_sentinel_;
   base::WeakPtrFactory<TaskQueueManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskQueueManager);
 };
 
-}  // namespace content
+}  // namespace scheduler
 
 #endif  // CONTENT_RENDERER_SCHEDULER_TASK_QUEUE_MANAGER_H_