Read files in chunks, not relaying on size.

tests/standalone/io/file_read_special_device_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 'dart:io';
+
+void openAndWriteScript(String script) {
+  var options = new Options();
+  var dir = new Path(options.script).directoryPath;
+  script = "$dir/$script";
+  var executable = options.executable;
+  var file = script;  // Use script as file.
+  Process.start("bash", ["-c", "$executable $script < $file"]).then((process) {
+    process.exitCode
+        .then((exitCode) {
+          Expect.equals(0, exitCode);
+        });
+  });
+}
+
+void testReadStdio() {
+  openAndWriteScript("file_read_stdio_script.dart");
+}
+
+void main() {
+  testReadStdio();
+}