Add serializers for window.performance.

third_party/WebKit/Source/core/timing/Performance.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 24 matching lines @@
 #include "core/CoreExport.h"
 #include "core/frame/DOMWindowProperty.h"
 #include "core/timing/MemoryInfo.h"
 #include "core/timing/PerformanceBase.h"
 #include "core/timing/PerformanceNavigation.h"
 #include "core/timing/PerformanceTiming.h"
 
 namespace blink {
 
 class InspectorWebPerfAgent;
+class ScriptState;
+class ScriptValue;
 
 class CORE_EXPORT Performance final : public PerformanceBase,
                                       public DOMWindowProperty {
   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(Performance);
   friend class PerformanceTest;
 
  public:
   static Performance* create(LocalFrame* frame) {
     return new Performance(frame);
   }
   ~Performance() override;
 
   ExecutionContext* getExecutionContext() const override;
 
   MemoryInfo* memory();
   PerformanceNavigation* navigation() const;
   PerformanceTiming* timing() const override;
 
   void updateLongTaskInstrumentation() override;
 
+  ScriptValue toJSONForBinding(ScriptState*) const;
+
   DECLARE_VIRTUAL_TRACE();
 
  private:
   explicit Performance(LocalFrame*);
 
   mutable Member<PerformanceNavigation> m_navigation;
   mutable Member<PerformanceTiming> m_timing;
   mutable Member<InspectorWebPerfAgent> m_longTaskInspectorAgent;
 };
 
 }  // namespace blink
 
 #endif  // Performance_h