Implement creation of ByteData objects using the Dart API.

runtime/lib/typeddata.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.
 
 // patch classes for Int8List ..... Float64List and ByteData implementations.
 
 patch class Int8List {
   /* patch */ factory Int8List(int length) {
     return new _Int8Array(length);
   }
@@ skipping 210 matching lines @@
 
   static _ExternalFloat64Array _newTransferable(int length) {
     return new _ExternalFloat64Array(length);
   }
 }
 
 
 patch class ByteData {
   /* patch */ factory ByteData(int length) {
     var list = new _Uint8Array(length);
-    return new _ByteDataView(list.buffer);
+    return new _ByteDataView(list.buffer, 0, length);
   }
 
   /* patch */ factory ByteData.transferable(int length) {
     var list = new _Uint8Array.transferable(length);
-    return new _ByteDataView(list.buffer);
+    return new _ByteDataView(list.buffer, 0, length);
   }
 
   /* patch */ factory ByteData.view(ByteBuffer buffer,
                                     [int offsetInBytes = 0, int length]) {
     if (length == null) {
       length = buffer.lengthInBytes;
     }
     return new _ByteDataView(buffer, offsetInBytes, length);
   }
 }
@@ skipping 2381 matching lines @@
   }
 }
 
 
 int _defaultIfNull(object, value) {
   if (object == null) {
     return value;
   }
   return object;
 }