Adds additional error reporting to GWTTestCase to discover flakiness problems.

Change-Id: I39dfcb5f70ea51292e1d601774052f3d22474775
Review-Link: https://gwt-review.googlesource.com/#/c/2080/

Review by: skybrian@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@11540 8db76d5a-ed1c-0410-87a9-c151d255dfc7
4 files changed