Add Isolate.current getter, returning the current isolate as an Isolate object.

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 249 matching lines @@
     utf8_package_root = zone->Alloc<char>(len + 1);
     package_root.ToUTF8(reinterpret_cast<uint8_t*>(utf8_package_root), len);
     utf8_package_root[len] = '\0';
   }
 
   return Spawn(isolate, new IsolateSpawnState(
       port.Id(), canonical_uri, utf8_package_root, args, message));
 }
 
 
+DEFINE_NATIVE_ENTRY(Isolate_getPortAndCapabilitiesOfCurrentIsolate, 0) {
+  const Array& result = Array::Handle(Array::New(3));
+  result.SetAt(0, SendPort::Handle(SendPort::New(isolate->main_port())));
+  result.SetAt(1, Capability::Handle(
+                      Capability::New(isolate->pause_capability())));
+  result.SetAt(2, Capability::Handle(
+                      Capability::New(isolate->terminate_capability())));
+  return result.raw();
+}
+
+
 DEFINE_NATIVE_ENTRY(Isolate_sendOOB, 2) {
   GET_NON_NULL_NATIVE_ARGUMENT(SendPort, port, arguments->NativeArgAt(0));
   GET_NON_NULL_NATIVE_ARGUMENT(Array, msg, arguments->NativeArgAt(1));
 
   // Make sure to route this request to the isolate library OOB mesage handler.
   msg.SetAt(0, Smi::Handle(Smi::New(Message::kIsolateLibOOBMsg)));
 
   uint8_t* data = NULL;
   MessageWriter writer(&data, &allocator);
   writer.WriteMessage(msg);
 
   PortMap::PostMessage(new Message(port.Id(),
                                    data, writer.BytesWritten(),
                                    Message::kOOBPriority));
   return Object::null();
 }
 
 }  // namespace dart