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

components/scheduler/child/web_task_runner_impl.h

Index: components/scheduler/child/web_task_runner_impl.h
diff --git a/components/scheduler/child/web_task_runner_impl.h b/components/scheduler/child/web_task_runner_impl.h
index 0773a95e611938e63d13b656dd366a568d066c0d..e5b61b491cedd975a7512fd12624c0211f4af6e4 100644
--- a/components/scheduler/child/web_task_runner_impl.h
+++ b/components/scheduler/child/web_task_runner_impl.h
@@ -13,6 +13,10 @@
 #include "components/scheduler/scheduler_export.h"
 #include "third_party/WebKit/public/platform/WebTaskRunner.h"
 
+namespace base {
+class SingleThreadTaskRunner;
+};
+
 namespace scheduler {
 class TaskQueue;
 
@@ -41,6 +45,9 @@ class SCHEDULER_EXPORT WebTaskRunnerImpl : public blink::WebTaskRunner {
   // Blink.
   static void runTask(std::unique_ptr<blink::WebTaskRunner::Task>);
 
+  static scoped_refptr<base::SingleThreadTaskRunner> GetBaseTaskRunner(
+      const blink::WebTaskRunner&);
+
  private:
   base::TimeTicks Now() const;