Add Process.runSync for running processe synchronously.

tests/standalone/io/process_sync_test.dart

+// Copyright (c) 2013, 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.
+
+import "package:expect/expect.dart";
+import "dart:io";
+
+test(int blockCount,
+     int stdoutBlockSize,
+     int stderrBlockSize,
+     int exitCode,
+     [int nonWindowsExitCode]) {
+  // Get the Dart script file which generated output.
+  var scriptFile =
+    new File("tests/standalone/io/process_sync_script.dart");
+  if (!scriptFile.existsSync()) {
+    scriptFile =
+        new File("../tests/standalone/io/process_sync_script.dart");
+  }
+  var args = [scriptFile.path,
+              blockCount.toString(),
+              stdoutBlockSize.toString(),
+              stderrBlockSize.toString(),
+              exitCode.toString()];
+  ProcessResult syncResult = Process.runSync(Platform.executable, args);
+  Expect.equals(blockCount * stdoutBlockSize, syncResult.stdout.length);
+  Expect.equals(blockCount * stderrBlockSize, syncResult.stderr.length);
+  if (Platform.isWindows) {
+    Expect.equals(exitCode, syncResult.exitCode);
+  } else {
+    if (nonWindowsExitCode == null) {
+      Expect.equals(exitCode, syncResult.exitCode);
+    } else {
+      Expect.equals(nonWindowsExitCode, syncResult.exitCode);
+    }
+  }
+  Process.run(Platform.executable, args).then((asyncResult) {
+    Expect.equals(syncResult.stdout, asyncResult.stdout);
+    Expect.equals(syncResult.stderr, asyncResult.stderr);
+    Expect.equals(syncResult.exitCode, asyncResult.exitCode);
+  });
+}
+
+main() {
+  test(10, 10, 10, 0);
+  test(10, 100, 10, 0);
+  test(10, 10, 100, 0);
+  test(100, 1, 10, 0);
+  test(100, 10, 1, 0);
+  test(100, 1, 1, 0);
+  test(1, 100000, 100000, 0);
+
+  test(10, 10, 10, 1);
+  test(10, 10, 10, 255);
+  test(10, 10, 10, -1, 255);
+  test(10, 10, 10, -255, 1);
+}
+