Clamp resolution of requestIdleCallback timeRemaining() to 5us.

third_party/WebKit/Source/core/timing/PerformanceBase.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 47 matching lines @@
 public:
     ~PerformanceBase() override;
 
     const AtomicString& interfaceName() const override;
 
     virtual PerformanceTiming* timing() const;
     double now() const;
 
     double timeOrigin() const { return m_timeOrigin; }
 
+    static double clampTimeResolution(double timeSeconds);
+
     PerformanceEntryVector getEntries() const;
     PerformanceEntryVector getEntriesByType(const String& entryType);
     PerformanceEntryVector getEntriesByName(const String& name, const String& entryType);
 
     void clearResourceTimings();
     void setResourceTimingBufferSize(unsigned);
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(resourcetimingbufferfull);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(webkitresourcetimingbufferfull);
 
@@ skipping 47 matching lines @@
     PerformanceEntryTypeMask m_observerFilterOptions;
     PerformanceObservers m_observers;
     PerformanceObservers m_activeObservers;
     PerformanceObservers m_suspendedObservers;
     Timer<PerformanceBase> m_deliverObservationsTimer;
 };
 
 } // namespace blink
 
 #endif // PerformanceBase_h