Implement list based output stream and add pipe to list based input streams

tests/standalone/src/ListOutputStreamTest.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.
+
+void testEmptyListOutputStream1() {
+  OutputStream stream = new ListOutputStream();
+  Expect.equals(null, stream.contents());
+  stream.close();
+  Expect.equals(null, stream.contents());
+  Expect.throws(() { stream.write([0]); });
+}
+
+
+void testEmptyListOutputStream2() {
+  OutputStream stream = new ListOutputStream();
+  ReceivePort donePort = new ReceivePort();
+
+  void onNoPendingWrite() {
+    stream.close();
+  }
+
+  void onClose() {
+    Expect.equals(null, stream.contents());
+    donePort.toSendPort().send(null);
+  }
+
+  stream.noPendingWriteHandler = onNoPendingWrite;
+  stream.closeHandler = onClose;
+
+  donePort.receive((x,y) => donePort.close());
+}
+
+
+void testListOutputStream1() {
+  OutputStream stream = new ListOutputStream();
+  Expect.equals(null, stream.contents());
+  stream.write([1, 2]);
+  stream.writeFrom([1, 2, 3, 4, 5], 2, 2);
+  stream.write([5]);
+  stream.close();
+  var contents = stream.contents();
+  Expect.equals(5, contents.length);
+  for (var i = 0; i < contents.length; i++) Expect.equals(i + 1, contents[i]);
+  Expect.equals(null, stream.contents());
+}
+
+
+void testListOutputStream2() {
+  OutputStream stream = new ListOutputStream();
+  ReceivePort donePort = new ReceivePort();
+  int stage = 0;
+  void onNoPendingWrite() {
+    switch (stage) {
+      case 0:
+        stream.write([1, 2]);
+        break;
+      case 1:
+        stream.writeFrom([1, 2, 3, 4, 5], 2, 2);
+        break;
+      case 2:
+        stream.write([5]);
+        break;
+      case 3:
+        stream.close();
+        break;
+    }
+    stage++;
+  }
+
+  void onClose() {
+    Expect.equals(4, stage);
+    var contents = stream.contents();
+    Expect.equals(5, contents.length);
+    for (var i = 0; i < contents.length; i++) Expect.equals(i + 1, contents[i]);
+    Expect.equals(null, stream.contents());
+    donePort.toSendPort().send(null);
+  }
+
+  stream.noPendingWriteHandler = onNoPendingWrite;
+  stream.closeHandler = onClose;
+
+  donePort.receive((x,y) => donePort.close());
+}
+
+main() {
+  testEmptyListOutputStream1();
+  testEmptyListOutputStream2();
+  testListOutputStream1();
+  testListOutputStream2();
+}