Enable ServerTiming support

third_party/WebKit/Source/core/frame/LocalDOMWindow.h

Index: third_party/WebKit/Source/core/frame/LocalDOMWindow.h
diff --git a/third_party/WebKit/Source/core/frame/LocalDOMWindow.h b/third_party/WebKit/Source/core/frame/LocalDOMWindow.h
index 2e8092195d2007a77b03c818f595940bde56bfc0..1a4a22fd3c8ebafe00397768f56f2f8baae31fcd 100644
--- a/third_party/WebKit/Source/core/frame/LocalDOMWindow.h
+++ b/third_party/WebKit/Source/core/frame/LocalDOMWindow.h
@@ -313,6 +313,9 @@ class CORE_EXPORT LocalDOMWindow final : public DOMWindow,
 
   FloatSize getViewportSize(IncludeScrollbarsInRect) const;
 
+  void setHasLoadEventFired() { m_hasLoadEventFired = true; }
+  bool hasLoadEventFired() { return m_hasLoadEventFired; }
+
  protected:
   // EventTarget overrides.
   void addedEventListener(const AtomicString& eventType,
@@ -343,6 +346,7 @@ class CORE_EXPORT LocalDOMWindow final : public DOMWindow,
   TaskRunnerTimer<LocalDOMWindow> m_unusedPreloadsTimer;
 
   bool m_shouldPrintWhenFinishedLoading;
+  bool m_hasLoadEventFired = false;
 
   mutable Member<Screen> m_screen;
   mutable Member<History> m_history;