Extract common code, add host IP to --debug and --enable-vm-service options

dart/runtime/bin/vmservice_impl.h

 // Copyright (c) 2013, 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.
 
 #ifndef BIN_VMSERVICE_IMPL_H_
 #define BIN_VMSERVICE_IMPL_H_
 
 #include "bin/vmservice.h"
 #include "platform/thread.h"
 
 
 namespace dart {
 namespace bin {
 
 class VmService {
  public:
   // Returns false if service could not be started.
-  static bool Start(intptr_t server_port);
+  static bool Start(const char *server_ip, intptr_t server_port);
   // Error message if startup failed.
   static const char* GetErrorMessage();
 
  private:
-  static bool _Start(intptr_t server_port);
+  static bool _Start(const char *server_ip, intptr_t server_port);
   static Dart_Handle GetSource(const char* name);
   static Dart_Handle LoadScript(const char* name);
   static Dart_Handle LoadSource(Dart_Handle library, const char* name);
   static Dart_Handle LoadResources(Dart_Handle library);
   static Dart_Handle LoadResource(Dart_Handle library, const char* name,
                                   const char* prefix);
   static Dart_Handle LibraryTagHandler(Dart_LibraryTag tag, Dart_Handle library,
                                        Dart_Handle url);
   static void ThreadMain(uword parameters);
   static const char* error_msg_;
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(VmService);
 };
 
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_VMSERVICE_IMPL_H_