Use high precision timestamp for Event.timestamp

third_party/WebKit/Source/core/testing/Internals.cpp

Index: third_party/WebKit/Source/core/testing/Internals.cpp
diff --git a/third_party/WebKit/Source/core/testing/Internals.cpp b/third_party/WebKit/Source/core/testing/Internals.cpp
index c76ec67a169bd412dc1815b1b02c6edfbab2c86d..2ec2bcbb7a1457746eb8491b347c8dd1ead6fa6c 100644
--- a/third_party/WebKit/Source/core/testing/Internals.cpp
+++ b/third_party/WebKit/Source/core/testing/Internals.cpp
@@ -2541,4 +2541,15 @@ void Internals::forceRestrictIFramePermissions()
     RuntimeEnabledFeatures::setRestrictIFramePermissionsEnabled(true);
 }
 
+double Internals::monotonicTimeToZeroBasedDocumentTime(double platformTime, ExceptionState& exceptionState)
+{
+    Document* document = contextDocument();
+    if (!document) {
+        exceptionState.throwDOMException(InvalidAccessError, "No context document is available.");
+        return 0;
+    }
+
+    return document->monotonicTimeToZeroBasedDocumentTime(platformTime);
+}
+
 } // namespace blink