Sigmund Cherem
f460a8706d
This uses 'packages/' as the default base to resolve uris from, but also exposes a hook to allow users to overwrite it. BUG= https://github.com/dart-lang/sdk/issues/25594 R=het@google.com, lrn@google.com Review URL: https://codereview.chromium.org/2495383003 .