Use BytesBuilder in pkg:http, when accumulating binary data.

This should speed up the library significant.

BUG=
R=sgjesse@google.com

Review URL: https://codereview.chromium.org//47923022

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/http@29739 260f80e4-7a28-3924-810f-c04153c831b5
1 file changed
tree: 0d30caa95c9c41fc815ffa5312c2b507c2bc8fdd
  1. lib/
  2. test/
  3. pubspec.yaml