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..8b72f06e1b571f69b69e70c2f533a6df86418383 100644
--- a/third_party/WebKit/Source/core/testing/Internals.cpp
+++ b/third_party/WebKit/Source/core/testing/Internals.cpp
@@ -105,6 +105,7 @@
 #include "core/layout/LayoutView.h"
 #include "core/layout/compositing/CompositedDeprecatedPaintLayerMapping.h"
 #include "core/layout/compositing/DeprecatedPaintLayerCompositor.h"
+#include "core/loader/DocumentLoader.h"
 #include "core/loader/FrameLoader.h"
 #include "core/loader/HistoryItem.h"
 #include "core/page/ChromeClient.h"
@@ -2541,4 +2542,15 @@ 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->loader()->timing().monotonicTimeToZeroBasedDocumentTime(platformTime);
+}
+
 } // namespace blink