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

third_party/WebKit/Source/core/frame/PerformanceMonitor.h

 // Copyright 2016 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 PerformanceMonitor_h
 #define PerformanceMonitor_h
 
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 #include "platform/scheduler/base/task_time_observer.h"
@@ skipping 102 matching lines @@
                                    Violation,
                                    const String& text,
                                    double time,
                                    std::unique_ptr<SourceLocation>);
 
   // scheduler::TaskTimeObserver implementation
   void WillProcessTask(scheduler::TaskQueue*, double start_time) override;
   void DidProcessTask(scheduler::TaskQueue*,
                       double start_time,
                       double end_time) override;
-  void OnBeginNestedMessageLoop() override {}
+  void OnBeginNestedRunLoop() override {}
   void WillExecuteScript(ExecutionContext*);
   void DidExecuteScript();
 
   std::pair<String, DOMWindow*> SanitizedAttribution(
       const HeapHashSet<Member<Frame>>& frame_contexts,
       Frame* observer_frame);
 
   bool enabled_ = false;
   double per_task_style_and_layout_time_ = 0;
   unsigned script_depth_ = 0;
@@ skipping 10 matching lines @@
   HeapHashMap<Violation,
               Member<ClientThresholds>,
               typename DefaultHash<size_t>::Hash,
               WTF::UnsignedWithZeroKeyHashTraits<size_t>>
       subscriptions_;
 };
 
 }  // namespace blink
 
 #endif  // PerformanceMonitor_h