Introduce an abstract DeclarationMirror in the implementation hierarchy; add a MirrorReference reflectee to TypedefMirror and TypeVariableMirror.

R=asiva@google.com

Review URL: https://codereview.chromium.org//19604004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@25187 260f80e4-7a28-3924-810f-c04153c831b5
2 files changed