[Reland] Post loading tasks on the appropriate WebFrameScheduler's queue

components/scheduler/child/web_task_runner_impl.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 COMPONENTS_SCHEDULER_CHILD_WEB_TASK_RUNNER_H_
 #define COMPONENTS_SCHEDULER_CHILD_WEB_TASK_RUNNER_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 16 matching lines @@
   const scoped_refptr<base::SingleThreadTaskRunner>& task_runner() const {
     return task_runner_;
   }
 
   // blink::WebTaskRunner implementation:
   void postTask(const blink::WebTraceLocation& web_location,
                 blink::WebTaskRunner::Task* task) override;
   void postDelayedTask(const blink::WebTraceLocation& web_location,
                        blink::WebTaskRunner::Task* task,
                        double delayMs) override;
+  blink::WebTaskRunner* clone() override;
 
  private:
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(WebTaskRunnerImpl);
 };
 
 }  // namespace scheduler
 
 #endif  // COMPONENTS_SCHEDULER_CHILD_WEB_TASK_RUNNER_H_