Move blink scheduler implementation into a component

components/scheduler/child/time_source.h

 // 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.
 
-#ifndef CONTENT_CHILD_SCHEDULER_TIME_SOURCE_H_
-#define CONTENT_CHILD_SCHEDULER_TIME_SOURCE_H_
+#ifndef COMPONENTS_SCHEDULER_CHILD_TIME_SOURCE_H_
+#define COMPONENTS_SCHEDULER_CHILD_TIME_SOURCE_H_
 
 #include "base/time/time.h"
-#include "content/common/content_export.h"
+#include "components/scheduler/scheduler_export.h"
 
-namespace content {
+namespace scheduler {
 
-class CONTENT_EXPORT TimeSource {
+class SCHEDULER_EXPORT TimeSource {
  public:
   TimeSource();
   virtual ~TimeSource();
 
   virtual base::TimeTicks Now() const;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TimeSource);
 };
 
-}  // namespace content
+}  // namespace scheduler
 
-#endif  // CONTENT_CHILD_SCHEDULER_TIME_SOURCE_H_
+#endif  // COMPONENTS_SCHEDULER_CHILD_TIME_SOURCE_H_