Adding support for Direction.LINE_START/END to DockLayoutPanel and SplitLayoutPanel. The new DockLayoutPanelRtlTest revealed a bug in DOMRtlTest where the document body wasn't actually in RTL mode for the test, making the test completely bogus. I've updated the test to force the body in RTL mode, and I changed the test to handle the quirkiness of RTL mode.

Review at http://gwt-code-reviews.appspot.com/828801

Review by: jgw@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@8714 8db76d5a-ed1c-0410-87a9-c151d255dfc7
9 files changed