Revert "Temporarily disable performance.now() in the d8 shell."

src/d8.h

 // Copyright 2012 the V8 project authors. 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 282 matching lines @@
   static void AddHistogramSample(void* histogram, int sample);
   static void MapCounters(const char* name);
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
   static Local<Object> DebugMessageDetails(Isolate* isolate,
                                            Handle<String> message);
   static Local<Value> DebugCommandToJSONRequest(Isolate* isolate,
                                                 Handle<String> command);
   static void DispatchDebugMessages();
 #endif  // ENABLE_DEBUGGER_SUPPORT
+
+  static void PerformanceNow(const v8::FunctionCallbackInfo<v8::Value>& args);
 #endif  // V8_SHARED
 
   static void RealmCurrent(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void RealmOwner(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void RealmGlobal(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void RealmCreate(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void RealmDispose(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void RealmSwitch(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void RealmEval(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void RealmSharedGet(Local<String> property,
@@ skipping 72 matching lines @@
   static Persistent<Context> evaluation_context_;
 #ifndef V8_SHARED
   static Persistent<Context> utility_context_;
   static CounterMap* counter_map_;
   // We statically allocate a set of local counters to be used if we
   // don't want to store the stats in a memory-mapped file
   static CounterCollection local_counters_;
   static CounterCollection* counters_;
   static i::OS::MemoryMappedFile* counters_file_;
   static i::Mutex context_mutex_;
+  static const i::TimeTicks kInitialTicks;
 
   static Counter* GetCounter(const char* name, bool is_histogram);
   static void InstallUtilityScript(Isolate* isolate);
 #endif  // V8_SHARED
   static void Initialize(Isolate* isolate);
   static void InitializeDebugger(Isolate* isolate);
   static void RunShell(Isolate* isolate);
   static bool SetOptions(int argc, char* argv[]);
   static Handle<ObjectTemplate> CreateGlobalTemplate(Isolate* isolate);
   static Handle<FunctionTemplate> CreateArrayBufferTemplate(FunctionCallback);
@@ skipping 16 matching lines @@
   static void ExternalArrayWeakCallback(Isolate* isolate,
                                         Persistent<Object>* object,
                                         uint8_t* data);
 };
 
 
 }  // namespace v8
 
 
 #endif  // V8_D8_H_