Handle stdin/stdout/stderr on Windows

runtime/bin/builtin.dart

Index: runtime/bin/builtin.dart
diff --git a/runtime/bin/builtin.dart b/runtime/bin/builtin.dart
index 88498e1379ea260ad80816a177984fd3b1f2eb5c..e893e18d23f62ef8413d06ad61f5ba64ed2cddde 100644
--- a/runtime/bin/builtin.dart
+++ b/runtime/bin/builtin.dart
@@ -19,7 +19,7 @@ Socket _stdin;
 OutputStream get stdin() {
   if (_stdin == null) {
     _stdin = new _Socket._internalReadOnly();
-    _stdin._id = 0;
+    _getStdioHandle(_stdin, 0);
   }
   return _stdin.inputStream;
 }
@@ -28,7 +28,7 @@ Socket _stdout;
 OutputStream get stdout() {
   if (_stdout == null) {
     _stdout = new _Socket._internalWriteOnly();
-    _stdout._id = 1;
+    _getStdioHandle(_stdout, 1);
   }
   return _stdout.outputStream;
 }
@@ -37,13 +37,15 @@ Socket _stderr;
 OutputStream get stderr() {
   if (_stderr == null) {
     _stderr = new _Socket._internalWriteOnly();
-    _stderr._id = 2;
+    _getStdioHandle(_stderr, 2);
   }
   return _stderr.outputStream;
 }
 
 _exit(int status) native "Exit";
 
+_getStdioHandle(Socket socket, int num) native "Socket_GetStdioHandle";
+
 class _Logger {
   static void _printString(String s) native "Logger_PrintString";
 }