Flush analysis server output stream when closed.

This ensures that if the analysis server terminated with an exception,
the stacktrace will actually be written to stdout before the server
exits.

BUG=dartbug.com/21494
R=brianwilkerson@google.com

Review URL: https://codereview.chromium.org//694413004

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41495 260f80e4-7a28-3924-810f-c04153c831b5
Update status of checked Dartium co19 DOM tests.

TBR=ricow@google.com
BUG=

Review URL: https://codereview.chromium.org//702723002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41496 260f80e4-7a28-3924-810f-c04153c831b5
Update status for Android content_shell on co19 DOM tests.

TBR=ricow@google.com
BUG=

Review URL: https://codereview.chromium.org//699883003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41497 260f80e4-7a28-3924-810f-c04153c831b5