Use high precision timestamp for Event.timestamp

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

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 87 matching lines @@
 #include "core/inspector/InspectorFrontendChannel.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/inspector/InstanceCounters.h"
 #include "core/inspector/InstrumentingAgents.h"
 #include "core/layout/LayoutMenuList.h"
 #include "core/layout/LayoutObject.h"
 #include "core/layout/LayoutTreeAsText.h"
 #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"
 #include "core/page/FocusController.h"
 #include "core/page/NetworkStateNotifier.h"
 #include "core/page/Page.h"
 #include "core/page/PrintContext.h"
 #include "core/page/scrolling/ScrollState.h"
 #include "core/paint/DeprecatedPaintLayer.h"
 #include "core/svg/SVGImageElement.h"
@@ skipping 2421 matching lines @@
         return false;
 
     return animator->setScrollbarsVisibleForTesting(visible);
 }
 
 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