Add RandomAccessFile.read method and use it for file input stream.

sdk/lib/io/file.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.
 
 
 /**
  * FileMode describes the modes in which a file can be opened.
  */
 class FileMode {
   static const READ = const FileMode._internal(0);
@@ skipping 286 matching lines @@
    */
   Future<int> readByte();
 
   /**
    * Synchronously read a single byte from the file. If end of file
    * has been reached -1 is returned.
    */
   int readByteSync();
 
   /**
+   * Reads from a file and returns the result as a list of bytes.
+   */
+  Future<List<int>> read(int bytes);
+
+  /**
+   * Synchronously reads from a file and returns the result in a
+   * list of bytes.
+   */
+  List<int> readSync(int bytes);
+
+  /**
    * Read a List<int> from the file. Returns a [:Future<int>:] that
    * completes with an indication of how much was read.
    */
   Future<int> readList(List<int> buffer, int offset, int bytes);
 
   /**
    * Synchronously read a List<int> from the file. Returns the number
    * of bytes read.
    */
   int readListSync(List<int> buffer, int offset, int bytes);
@@ skipping 117 matching lines @@
         sb.add(" ($osError)");
       }
     } else if (osError != null) {
       sb.add(": osError");
     }
     return sb.toString();
   }
   final String message;
   final OSError osError;
 }