Give isolates names to be used during debugging.

runtime/vm/port_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/assert.h"
 #include "vm/message_queue.h"
 #include "vm/os.h"
 #include "vm/port.h"
 #include "vm/unit_test.h"
 
@@ skipping 188 matching lines @@
   Isolate* isolate = Isolate::Current();
   PortMessage* result = isolate->message_queue()->Dequeue(0);
   return result;
 }
 
 
 void ThreadedPort_start(uword parameter) {
   // We only need an isolate here because the MutexLocker in
   // PortMap::CreatePort expects it, we don't need to initialize
   // the isolate as it does not run any dart code.
-  Dart::CreateIsolate();
+  Dart::CreateIsolate(NULL);
 
   intptr_t remote = parameter;
   intptr_t local = PortMap::CreatePort();
 
   PortMap::PostMessage(remote, 0, AllocIntData(local));
 
   intptr_t count = 0;
   while (true) {
     PortMessage* msg = NextMessage();
     EXPECT_EQ(local, msg->dest_port());
@@ skipping 43 matching lines @@
   // Give the spawned thread enough time to properly exit.
   Monitor* waiter = new Monitor();
   {
     MonitorLocker ml(waiter);
     ml.Wait(20);
   }
   delete waiter;
 }
 
 }  // namespace dart