Force events to be non blocking if main thread is unresponsive.

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

Index: third_party/WebKit/Source/core/frame/PerformanceMonitor.h
diff --git a/third_party/WebKit/Source/core/frame/PerformanceMonitor.h b/third_party/WebKit/Source/core/frame/PerformanceMonitor.h
index 07e018c3460edbb2c87b7eab429e4bf9ebc88ef0..f82ca9c635893b6d28c4fa09e9230675a77a846e 100644
--- a/third_party/WebKit/Source/core/frame/PerformanceMonitor.h
+++ b/third_party/WebKit/Source/core/frame/PerformanceMonitor.h
@@ -91,9 +91,9 @@ class CORE_EXPORT PerformanceMonitor final
   void didProcessTask() override;
 
   // scheduler::TaskTimeObserver implementation
-  void ReportTaskTime(scheduler::TaskQueue*,
-                      double startTime,
-                      double endTime) override;
+  void ReportTaskEndTime(scheduler::TaskQueue*,
+                         double startTime,
+                         double endTime) override;
 
   std::pair<String, DOMWindow*> sanitizedAttribution(
       const HeapHashSet<Member<Frame>>& frameContexts,