Make nesting/running states a RunLoop rather than a MessageLoop concept.

third_party/WebKit/Source/platform/scheduler/child/scheduler_tqm_delegate_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 "platform/scheduler/child/scheduler_tqm_delegate_impl.h"
 
 #include <utility>
 
+#include "base/run_loop.h"
+
 namespace blink {
 namespace scheduler {
 
 // static
 scoped_refptr<SchedulerTqmDelegateImpl> SchedulerTqmDelegateImpl::Create(
     base::MessageLoop* message_loop,
     std::unique_ptr<base::TickClock> time_source) {
   return make_scoped_refptr(
       new SchedulerTqmDelegateImpl(message_loop, std::move(time_source)));
 }
@@ skipping 33 matching lines @@
     base::TimeDelta delay) {
   return message_loop_task_runner_->PostNonNestableDelayedTask(
       from_here, std::move(task), delay);
 }
 
 bool SchedulerTqmDelegateImpl::RunsTasksOnCurrentThread() const {
   return message_loop_task_runner_->RunsTasksOnCurrentThread();
 }
 
 bool SchedulerTqmDelegateImpl::IsNested() const {
-  return message_loop_->IsNested();
+  DCHECK(RunsTasksOnCurrentThread());
+  return base::RunLoop::IsNestedOnCurrentThread();
 }
 
 void SchedulerTqmDelegateImpl::AddNestingObserver(
-    base::MessageLoop::NestingObserver* observer) {
-  message_loop_->AddNestingObserver(observer);
+    base::RunLoop::NestingObserver* observer) {
+  base::RunLoop::AddNestingObserverOnCurrentThread(observer);
 }
 
 void SchedulerTqmDelegateImpl::RemoveNestingObserver(
-    base::MessageLoop::NestingObserver* observer) {
-  message_loop_->RemoveNestingObserver(observer);
+    base::RunLoop::NestingObserver* observer) {
+  base::RunLoop::RemoveNestingObserverOnCurrentThread(observer);
 }
 
 base::TimeTicks SchedulerTqmDelegateImpl::NowTicks() {
   return time_source_->NowTicks();
 }
 
 }  // namespace scheduler
 }  // namespace blink