Reland of d8 workers: make sure Shell::Quit is only called once

src/d8.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_D8_H_
 #define V8_D8_H_
 
 #ifndef V8_SHARED
 #include "src/allocation.h"
 #include "src/hashmap.h"
 #include "src/list.h"
 #include "src/v8.h"
 #else
 #include "include/v8.h"
 #include "src/base/compiler-specific.h"
 #endif  // !V8_SHARED
 
+#include "src/base/once.h"
+
+
 namespace v8 {
 
 
 #ifndef V8_SHARED
 // A single counter in a counter collection.
 class Counter {
  public:
   static const int kMaxNameSize = 64;
   int32_t* Bind(const char* name, bool histogram);
   int32_t* ptr() { return &count_; }
@@ skipping 376 matching lines @@
   static void RealmSwitch(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void RealmEval(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void RealmSharedGet(Local<String> property,
                              const  PropertyCallbackInfo<Value>& info);
   static void RealmSharedSet(Local<String> property,
                              Local<Value> value,
                              const  PropertyCallbackInfo<void>& info);
 
   static void Print(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void Write(const v8::FunctionCallbackInfo<v8::Value>& args);
+  static void QuitOnce(v8::FunctionCallbackInfo<v8::Value>* args);
   static void Quit(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void Version(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void Read(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void ReadBuffer(const v8::FunctionCallbackInfo<v8::Value>& args);
   static Handle<String> ReadFromStdin(Isolate* isolate);
   static void ReadLine(const v8::FunctionCallbackInfo<v8::Value>& args) {
     args.GetReturnValue().Set(ReadFromStdin(args.GetIsolate()));
   }
   static void Load(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void WorkerNew(const v8::FunctionCallbackInfo<v8::Value>& args);
@@ skipping 37 matching lines @@
 
   static void AddOSMethods(v8::Isolate* isolate,
                            Handle<ObjectTemplate> os_template);
 
   static const char* kPrompt;
   static ShellOptions options;
   static ArrayBuffer::Allocator* array_buffer_allocator;
 
  private:
   static Persistent<Context> evaluation_context_;
+  static base::OnceType quit_once_;
 #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 base::OS::MemoryMappedFile* counters_file_;
   static base::Mutex context_mutex_;
   static const base::TimeTicks kInitialTicks;
@@ skipping 11 matching lines @@
   static void RunShell(Isolate* isolate);
   static bool SetOptions(int argc, char* argv[]);
   static Handle<ObjectTemplate> CreateGlobalTemplate(Isolate* isolate);
 };
 
 
 }  // namespace v8
 
 
 #endif  // V8_D8_H_