Change the thread interface in runtime/platform and use it starting all threads

runtime/lib/isolate.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/bootstrap_natives.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_entry.h"
@@ skipping 280 matching lines @@
     ASSERT(spawned_isolate != NULL);
     // Check arguments to see if the specified library and classes are
     // loaded, this check will throw an exception if they are not loaded.
     if (init_successful && CheckArguments(library_url, class_name)) {
       port_id = spawned_isolate->main_port();
       uword data = reinterpret_cast<uword>(
           new IsolateStartData(spawned_isolate,
                                strdup(library_url),
                                strdup(class_name),
                                port_id));
-      new Thread(RunIsolate, data);
+      Thread::Start(RunIsolate, data);
     } else {
       // Error spawning the isolate, maybe due to initialization errors or
       // errors while loading the application into spawned isolate, shut
       // it down and report error.
       // Make sure to grab the error message out of the isolate before it has
       // been shutdown and to allocate it in the preserved isolates zone.
       {
         Zone zone(spawned_isolate);
         HandleScope scope(spawned_isolate);
         const Error& err_obj = Error::Handle(
@@ skipping 47 matching lines @@
   intptr_t send_id = Smi::CheckedHandle(arguments->At(0)).Value();
   intptr_t reply_id = Smi::CheckedHandle(arguments->At(1)).Value();
   // TODO(iposva): Allow for arbitrary messages to be sent.
   uint8_t* data = SerializeObject(Instance::CheckedHandle(arguments->At(2)));
 
   // TODO(turnidge): Throw an exception when the return value is false?
   PortMap::PostMessage(send_id, reply_id, Api::CastMessage(data));
 }
 
 }  // namespace dart