Use per-frame TaskRunner instead of thread's default in DataConsumerHandle

components/scheduler/child/web_task_runner_impl.cc

 // 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.
 
 #include "components/scheduler/child/web_task_runner_impl.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
 #include "components/scheduler/base/task_queue.h"
@@ skipping 51 matching lines @@
 
 std::unique_ptr<blink::WebTaskRunner> WebTaskRunnerImpl::clone() {
   return base::WrapUnique(new WebTaskRunnerImpl(task_queue_));
 }
 
 void WebTaskRunnerImpl::runTask(
     std::unique_ptr<blink::WebTaskRunner::Task> task) {
   task->run();
 }
 
+// static
+scoped_refptr<base::SingleThreadTaskRunner>
+WebTaskRunnerImpl::GetBaseTaskRunner(const blink::WebTaskRunner& task_runner) {
+  return static_cast<const WebTaskRunnerImpl&>(task_runner).task_queue_;
+}
+
 }  // namespace scheduler