Reland of Worker: Introduce per-global-scope task scheduler

third_party/WebKit/Source/platform/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 THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_CHILD_WEB_TASK_RUNNER_IMPL_H_
 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_CHILD_WEB_TASK_RUNNER_IMPL_H_
 
 #include <memory>
 
 #include "base/callback.h"
@@ skipping 13 matching lines @@
 
   // WebTaskRunner implementation:
   void PostDelayedTask(const WebTraceLocation&,
                        base::OnceClosure,
                        double delay_ms) override;
   bool RunsTasksOnCurrentThread() override;
   double VirtualTimeSeconds() const override;
   double MonotonicallyIncreasingVirtualTimeSeconds() const override;
   base::SingleThreadTaskRunner* ToSingleThreadTaskRunner() override;
 
+  TaskQueue* GetTaskQueue() const { return task_queue_.get(); }
+
  private:
   explicit WebTaskRunnerImpl(scoped_refptr<TaskQueue> task_queue);
   ~WebTaskRunnerImpl() override;
 
   base::TimeTicks Now() const;
 
   scoped_refptr<TaskQueue> task_queue_;
 
   DISALLOW_COPY_AND_ASSIGN(WebTaskRunnerImpl);
 };
 
 }  // namespace scheduler
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_CHILD_WEB_TASK_RUNNER_IMPL_H_