Add support for interrupting an isolate in the vm. Interrupts are

runtime/bin/main.cc

 // Copyright (c) 2011, 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 <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
 #include "include/dart_api.h"
 #include "include/dart_debugger_api.h"
@@ skipping 285 matching lines @@
                      &vm_options,
                      &script_name,
                      &dart_options) < 0) {
     PrintUsage();
     return 255;
   }
 
   Dart_SetVMFlags(vm_options.count(), vm_options.arguments());
 
   // Initialize the Dart VM.
-  Dart_Initialize(CreateIsolateAndSetup);
+  Dart_Initialize(CreateIsolateAndSetup, NULL);
 
   canonical_script_name = File::GetCanonicalPath(script_name);
   if (canonical_script_name == NULL) {
     fprintf(stderr, "Unable to find '%s'\n", script_name);
     return 255;  // Indicates we encountered an error.
   }
 
   // Call CreateIsolateAndSetup which creates an isolate and loads up
   // the specified application script.
   char* error = NULL;
@@ skipping 92 matching lines @@
     return 255;  // Indicates we encountered an error.
   }
   free(canonical_script_name);
   Dart_ExitScope();
   // Dump symbol information for the profiler.
   DumpPprofSymbolInfo();
   // Shutdown the isolate.
   Dart_ShutdownIsolate();
   return 0;
 }