Use v8::internal threading support in samples/shell.cc.

test/cctest/test-threads.cc

 // Copyright 2008 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 46 matching lines @@
   CLEAN_CACHE,
   SECOND_TIME_FILL_CACHE,
   DONE
 };
 
 static Turn turn = FILL_CACHE;
 
 
 class ThreadA: public v8::internal::Thread {
  public:
-  explicit ThreadA(i::Isolate* isolate) : Thread(isolate) { }
+  explicit ThreadA(i::Isolate* isolate) : Thread(isolate, "ThreadA") { }
   void Run() {
     v8::Locker locker;
     v8::HandleScope scope;
     v8::Context::Scope context_scope(v8::Context::New());
 
     CHECK_EQ(FILL_CACHE, turn);
 
     // Fill String.search cache.
     v8::Handle<v8::Script> script = v8::Script::Compile(
         v8::String::New(
@@ skipping 15 matching lines @@
     // Rerun the script.
     CHECK(script->Run()->IsTrue());
 
     turn = DONE;
   }
 };
 
 
 class ThreadB: public v8::internal::Thread {
  public:
-  explicit ThreadB(i::Isolate* isolate) : Thread(isolate) { }
+  explicit ThreadB(i::Isolate* isolate) : Thread(isolate, "ThreadB") { }
   void Run() {
     do {
       {
         v8::Locker locker;
         if (turn == CLEAN_CACHE) {
           v8::HandleScope scope;
           v8::Context::Scope context_scope(v8::Context::New());
 
           // Clear the caches by forcing major GC.
           HEAP->CollectAllGarbage(false);
@@ skipping 15 matching lines @@
   ThreadB threadB(i::Isolate::Current());
 
   threadA.Start();
   threadB.Start();
 
   threadA.Join();
   threadB.Join();
 
   CHECK_EQ(DONE, turn);
 }