Extract code from dependency_grapher.dart for easier re-use elsewhere in the front end.

Extract code from dependency_grapher.dart for easier re-use elsewhere in the front end.

In the process I've made the constructors for Graph, LibraryCycleNode,
and LibraryNode public.  I don't think this should be a problem, since
these are simple data structures, so there is no harm in allowing
clients to create them.

R=sigmund@google.com

Committed: https://github.com/dart-lang/sdk/commit/1d57e1b09689d5e43010ccdcd3eb369e66b702e2

[Paul Berry, 2017-01-06 18:45:20]

paulberry@google.com changed reviewers:
+ danrubel@google.com, sigmund@google.com

[Siggi Cherem (dart-lang), 2017-01-06 19:32:31]

lgtm

[Paul Berry, 2017-01-06 19:37:17]

Description was changed from

==========
Extract code from dependency_grapher.dart for easier re-use elsewhere in the
front end.

In the process I've made the constructors for Graph, LibraryCycleNode,
and LibraryNode public.  I don't think this should be a problem, since
these are simple data structures, so there is no harm in allowing
clients to create them.
==========

to

==========
Extract code from dependency_grapher.dart for easier re-use elsewhere in the
front end.

In the process I've made the constructors for Graph, LibraryCycleNode,
and LibraryNode public.  I don't think this should be a problem, since
these are simple data structures, so there is no harm in allowing
clients to create them.

R=sigmund@google.com

Committed:
https://github.com/dart-lang/sdk/commit/1d57e1b09689d5e43010ccdcd3eb369e66b702e2
==========

[Paul Berry, 2017-01-06 19:37:18]

Committed patchset #1 (id:1) manually as
1d57e1b09689d5e43010ccdcd3eb369e66b702e2 (presubmit successful).