Generate hashcode on the java types.

R=brianwilkerson@google.com, paulberry@google.com

Review URL: https://codereview.chromium.org//498593003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@39513 260f80e4-7a28-3924-810f-c04153c831b5
Send RenameFeedback.

R=brianwilkerson@google.com
BUG=

Review URL: https://codereview.chromium.org//501843002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@39514 260f80e4-7a28-3924-810f-c04153c831b5