Ensure that errors have stack traces attached.

This adds a stack trace argument to all [completeError] and [addError]
calls in pub and associated libraries.

R=rnystrom@google.com
BUG=

Review URL: https://codereview.chromium.org//68493003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/http@30332 260f80e4-7a28-3924-810f-c04153c831b5
2 files changed
tree: c83fff43ed39a8fe567ad2dac5a9b1f266bdc378
  1. lib/
  2. test/
  3. pubspec.yaml