Introduce runtime/platform directory for code shared between vm

runtime/bin/directory.h

 // 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.
 
 #ifndef BIN_DIRECTORY_H_
 #define BIN_DIRECTORY_H_
 
 #include "bin/builtin.h"
-#include "bin/globals.h"
+
+#include "platform/globals.h"
 
 class Directory {
  public:
   enum ExistsResult {
     UNKNOWN,
     EXISTS,
     DOES_NOT_EXIST
   };
 
   static void List(const char* path,
@@ skipping 12 matching lines @@
                         char* os_error_message,
                         int os_error_message_len);
 
   static bool Delete(const char* path);
 
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(Directory);
 };
 
 #endif  // BIN_DIRECTORY_H_