Add the ability to run tests with several sets of VM flags

runtime/tests/dart/src/ProcessStderrTest.dart

 // 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.
 //
 // Process test program to test process communication.
+//
+// VMOptions=
+// VMOptions=--short_socket_read
+// VMOptions=--short_socket_write
+// VMOptions=--short_socket_read --short_socket_write
 
 class ProcessStderrTest {
 
   static void testExit() {
     Process process = new Process("out/Debug_ia32/process_test",
                                   const ["1", "1", "99", "0"]);
     final int BUFFERSIZE = 10;
     final int STARTCHAR = 65;
     List<int> buffer = new List<int>(BUFFERSIZE);
     for (int i = 0; (i < BUFFERSIZE - 1); i++) {
       buffer[i] = STARTCHAR + i;
     }
     buffer[BUFFERSIZE - 1] = 10;
 
     SocketInputStream input = process.stderrStream;
     SocketOutputStream output = process.stdinStream;
 
     process.start();
 
     List<int> readBuffer = new List<int>(BUFFERSIZE);
 
     void dataWritten() {
       void readData() {
         for (int i = 0; i < BUFFERSIZE; i++) {
           Expect.equals(buffer[i], readBuffer[i]);
         }
         process.close();
       }
 
-      bool read = input.read(readBuffer, 0, BUFFERSIZE, readData); 
+      bool read = input.read(readBuffer, 0, BUFFERSIZE, readData);
       if (read) {
         readData();
       }
     }
     bool written = output.write(buffer, 0, BUFFERSIZE, dataWritten);
     if (written) {
       dataWritten();
     }
   }
 
   static void testMain() {
     testExit();
   }
 }
 
 main() {
   ProcessStderrTest.testMain();
 }