Add a system() call to the d8 shell (Unix only).

src/d8.h

Index: src/d8.h
===================================================================
--- src/d8.h	(revision 1618)
+++ src/d8.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright 2008 the V8 project authors. All rights reserved.
+// Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -130,6 +130,17 @@
   static Handle<Value> Quit(const Arguments& args);
   static Handle<Value> Version(const Arguments& args);
   static Handle<Value> Load(const Arguments& args);
+  // system("program_name", ["arg1", "arg2", ...], timeout1, timeout2) will run
+  // the command, passing the arguments to the program.  The standard output of
+  // the program will be picked up and returned as a multiline string.  If
+  // timeout1 is present then it should be a number.  -1 indicates no timeout
+  // and a positive number is used as a timeout in milliseconds that limits the
+  // time spent waiting between receiving output characters from the program.
+  // timeout2, if present, should be a number indicating the limit in
+  // milliseconds on the total running time of the program.  Exceptions are
+  // thrown on timeouts or other errors or if the exit status of the program
+  // indicates an error.
+  static Handle<Value> System(const Arguments& args);
 
   static Handle<Context> utility_context() { return utility_context_; }