Expose RunsTasksOnCurrentThread through WebTaskRunner

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 20 matching lines @@
     blink::WebTaskRunner::Task* task,
     double delayMs) {
   DCHECK_GE(delayMs, 0.0);
   task_queue_->PostDelayedTask(
       location,
       base::Bind(&WebTaskRunnerImpl::runTask,
                  base::Passed(base::WrapUnique(task))),
       base::TimeDelta::FromMillisecondsD(delayMs));
 }
 
+bool WebTaskRunnerImpl::runsTasksOnCurrentThread() {
+  return task_queue_->RunsTasksOnCurrentThread();
+}
+
 double WebTaskRunnerImpl::virtualTimeSeconds() const {
   return (Now() - base::TimeTicks::UnixEpoch()).InSecondsF();
 }
 
 double WebTaskRunnerImpl::monotonicallyIncreasingVirtualTimeSeconds() const {
   return Now().ToInternalValue() /
          static_cast<double>(base::Time::kMicrosecondsPerSecond);
 }
 
 base::TimeTicks WebTaskRunnerImpl::Now() const {
   TimeDomain* time_domain = task_queue_->GetTimeDomain();
   // It's possible task_queue_ has been Unregistered which can lead to a null
   // TimeDomain.  If that happens just return the current real time.
   if (!time_domain)
     return base::TimeTicks::Now();
   return time_domain->Now();
 }
 
 blink::WebTaskRunner* WebTaskRunnerImpl::clone() {
   return new WebTaskRunnerImpl(task_queue_);
 }
 
 void WebTaskRunnerImpl::runTask(
     std::unique_ptr<blink::WebTaskRunner::Task> task) {
   task->run();
 }
 
 }  // namespace scheduler