Clamp PerformanceResource and PerformanceTiming to 5us.

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

Index: third_party/WebKit/Source/core/timing/PerformanceResourceTiming.cpp
diff --git a/third_party/WebKit/Source/core/timing/PerformanceResourceTiming.cpp b/third_party/WebKit/Source/core/timing/PerformanceResourceTiming.cpp
index 40be89c333aa8a5b606ea0ee8b52304411572300..a319b17d802a6a28e793ddc5460f028f2a1f1a7d 100644
--- a/third_party/WebKit/Source/core/timing/PerformanceResourceTiming.cpp
+++ b/third_party/WebKit/Source/core/timing/PerformanceResourceTiming.cpp
@@ -32,6 +32,7 @@
 #include "config.h"
 #include "core/timing/PerformanceResourceTiming.h"
 
+#include "core/timing/PerformanceBase.h"
 #include "platform/network/ResourceRequest.h"
 #include "platform/network/ResourceResponse.h"
 #include "platform/network/ResourceTimingInfo.h"
@@ -43,7 +44,7 @@ static double monotonicTimeToDOMHighResTimeStamp(double timeOrigin, double secon
     ASSERT(seconds >= 0.0);
     if (!seconds)
         return 0.0;
-    return (seconds - timeOrigin) * 1000.0;
+    return PerformanceBase::clampTimeResolution(seconds - timeOrigin) * 1000.0;
 }
 
 PerformanceResourceTiming::PerformanceResourceTiming(const ResourceTimingInfo& info, double timeOrigin, double startTime, double lastRedirectEndTime, bool allowTimingDetails, bool allowRedirectDetails)