Fix source_span tests.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//712473002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41614 260f80e4-7a28-3924-810f-c04153c831b5
Mark the source_span file test as passing.

R=rnystrom@google.com
TBR

Review URL: https://codereview.chromium.org//700923004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41615 260f80e4-7a28-3924-810f-c04153c831b5
Fix issue 20577

R=paulberry@google.com

Review URL: https://codereview.chromium.org//705393002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41616 260f80e4-7a28-3924-810f-c04153c831b5
Fix the icon for private classes.

R=brianwilkerson@google.com
BUG=

Review URL: https://codereview.chromium.org//708073004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41617 260f80e4-7a28-3924-810f-c04153c831b5
Use ElementLabelProvider in type hierarchy, improve icons.

R=brianwilkerson@google.com
BUG=

Review URL: https://codereview.chromium.org//689113005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41618 260f80e4-7a28-3924-810f-c04153c831b5
Fix possible cause of hung editor

R=scheglov@google.com

Review URL: https://codereview.chromium.org//711823002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41619 260f80e4-7a28-3924-810f-c04153c831b5
Issue 20827. Add imports as needed the 'Add type annotation' Quick Assist.

I left some TODOs, the CL is big enough already.

R=paulberry@google.com
BUG= https://code.google.com/p/dart/issues/detail?id=20827

Review URL: https://codereview.chromium.org//706263003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41620 260f80e4-7a28-3924-810f-c04153c831b5