Make StreamIterator not delay pausing between requests.

sdk/lib/async/stream.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.
 
 part of dart.async;
 
 // -------------------------------------------------------------------
 // Core Stream types
 // -------------------------------------------------------------------
 
@@ skipping 1749 matching lines @@
  * This wraps a [Stream] and a subscription on the stream. It listens
  * on the stream, and completes the future returned by [moveNext] when the
  * next value becomes available.
  */
 abstract class StreamIterator<T> {
 
   /** Create a [StreamIterator] on [stream]. */
   factory StreamIterator(Stream<T> stream)
       // TODO(lrn): use redirecting factory constructor when type
       // arguments are supported.
-      => new _StreamIteratorImpl<T>(stream);
+      => new _StreamIterator<T>(stream);
 
   /**
    * Wait for the next stream value to be available.
    *
    * Returns a future which will complete with either `true` or `false`.
    * Completing with `true` means that another event has been received and
    * can be read as [current].
    * Completing with `false` means that the stream itearation is done and
    * no further events will ever be available.
    * The future may complete with an error, if the stream produces an error,
@@ skipping 21 matching lines @@
   /**
    * Cancels the stream iterator (and the underlying stream subscription) early.
    *
    * The stream iterator is automatically canceled if the [moveNext] future
    * completes with either `false` or an error.
    *
    * If you need to stop listening for values before the stream iterator is
    * automatically closed, you must call [cancel] to ensure that the stream
    * is properly closed.
    *
-   * If [moveNext] has been called when the iterator is cancelled,
+   * If [moveNext] has been called when the iterator is canceled,
    * its returned future will complete with `false` as value,
    * as will all further calls to [moveNext].
    *
    * Returns a future if the cancel-operation is not completed synchronously.
    * Otherwise returns `null`.
    */
   Future cancel();
 }
 
 
 /**
  * Wraps an [_EventSink] so it exposes only the [EventSink] interface.
  */
 class _ControllerEventSinkWrapper<T> implements EventSink<T> {
   EventSink _sink;
   _ControllerEventSinkWrapper(this._sink);
 
   void add(T data) { _sink.add(data); }
   void addError(error, [StackTrace stackTrace]) {
     _sink.addError(error, stackTrace);
   }
   void close() { _sink.close(); }
 }