Assert event timestamp to be monotonic and not from future

third_party/WebKit/Source/web/WebTestingSupport.cpp

Index: third_party/WebKit/Source/web/WebTestingSupport.cpp
diff --git a/third_party/WebKit/Source/web/WebTestingSupport.cpp b/third_party/WebKit/Source/web/WebTestingSupport.cpp
index ef1623b6b95377ca3525c2d4fede9cd106571bc4..ebde58be7373745c38221653c3a4f44f8c022f09 100644
--- a/third_party/WebKit/Source/web/WebTestingSupport.cpp
+++ b/third_party/WebKit/Source/web/WebTestingSupport.cpp
@@ -28,6 +28,7 @@
 #include "bindings/modules/v8/V8InternalsPartial.h"
 #include "core/testing/v8/WebCoreTestSupport.h"
 #include "public/web/WebLocalFrame.h"
+#include "wtf/CurrentTime.h"
 #include <v8/include/v8.h>
 
 namespace blink {
@@ -58,4 +59,9 @@ void WebTestingSupport::injectInternalsObject(v8::Local<v8::Context> context)
     WebCoreTestSupport::injectInternalsObject(context);
 }
 
+void WebTestingSupport::setMonotonicallyIncreasingTimeFunctionForTesting(TimeFunction timeFunction)
+{
+    WTF::setMonotonicallyIncreasingTimeFunctionForTesting(timeFunction);
+}
+
 } // namespace blink