Cleanup and fixes to some dart:io files

runtime/bin/string_stream.dart

 // Copyright (c) 2012, 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.
 
 // Interface for decoders decoding binary data into string data. The
 // decoder keeps track of line breaks during decoding.
 interface _StringDecoder {
   // Add more binary data to be decoded. The ownership of the buffer
   // is transfered to the decoder and the caller most not modify it any more.
   int write(List<int> buffer);
 
   // Returns whether any decoded data is available.
   bool isEmpty();
 
+  // Returns the number of available decoded characters.
+  int available();
+
   // Get the number of line breaks present in the current decoded
   // data.
-  int lineBreaks();
+  int get lineBreaks;
 
   // Get the string data decoded since the last call to [decode] or
   // [decodeLine]. Returns null if no decoded data is available.
   String get decoded;
 
   // Get the string data decoded since the last call to [decode] or
   // [decodeLine] up to the next line break present. Returns null if
   // no line break is present. The line break character sequence is
   // discarded.
   String get decodedLine;
@@ skipping 38 matching lines @@
     _bufferList.add(buffer);
     // Decode as many bytes into characters as possible.
     while (_bufferList.length > 0) {
       if (!_processNext()) {
         break;
       }
     }
     return buffer.length;
   }
 
-  bool isEmpty() {
-    return _result.isEmpty();
-  }
+  bool isEmpty() => _result.isEmpty();
 
   int get lineBreaks => _lineBreaks;
 
   String get decoded {
     if (isEmpty()) return null;
 
     String result;
     if (_resultOffset == 0) {
       result = new String.fromCharCodes(_result);
     } else {
@@ skipping 425 matching lines @@
   bool _inputClosed = false;  // Is the underlying input stream closed?
   bool _closed = false;  // Is this stream closed.
   bool _eof = false;  // Has all data been read from the decoder?
   Timer _scheduledDataCallback;
   Timer _scheduledLineCallback;
   Timer _scheduledCloseCallback;
   Function _clientDataHandler;
   Function _clientLineHandler;
   Function _clientCloseHandler;
 }