Clamp PerformanceResource and PerformanceTiming to 5us.

third_party/WebKit/Source/core/timing/PerformanceTiming.cpp

 /*
  * Copyright (C) 2010 Google 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 21 matching lines @@
 #include "core/timing/PerformanceTiming.h"
 
 #include "bindings/core/v8/ScriptValue.h"
 #include "bindings/core/v8/V8ObjectBuilder.h"
 #include "core/dom/Document.h"
 #include "core/dom/DocumentTiming.h"
 #include "core/frame/LocalFrame.h"
 #include "core/loader/DocumentLoadTiming.h"
 #include "core/loader/DocumentLoader.h"
 #include "core/loader/FrameLoader.h"
+#include "core/timing/PerformanceBase.h"
 #include "platform/network/ResourceLoadTiming.h"
 #include "platform/network/ResourceResponse.h"
 
 namespace blink {
 
 static unsigned long long toIntegerMilliseconds(double seconds)
 {
     ASSERT(seconds >= 0);
-    return static_cast<unsigned long long>(seconds * 1000.0);
+    double clampedSeconds = PerformanceBase::clampTimeResolution(seconds);
+    return static_cast<unsigned long long>(clampedSeconds * 1000.0);
 }
 
 static double toDoubleSeconds(unsigned long long integerMilliseconds)
 {
     return integerMilliseconds / 1000.0;
 }
 
 PerformanceTiming::PerformanceTiming(LocalFrame* frame)
     : DOMWindowProperty(frame)
 {
@@ skipping 344 matching lines @@
 
     return timing->pseudoWallTimeToMonotonicTime(toDoubleSeconds(integerMilliseconds));
 }
 
 DEFINE_TRACE(PerformanceTiming)
 {
     DOMWindowProperty::trace(visitor);
 }
 
 } // namespace blink