Fix history on workspaces, where you couldn't click on old tries.

Also allow editing the first and last line because you might need
to do that to fix "old" tries that are already stored in the database.
By "old" I mean yesterday.

BUG=skia:
R=fmalita@google.com, fmalita@chromium.org

Author: jcgregorio@google.com

Review URL: https://codereview.chromium.org/264833004

git-svn-id: http://skia.googlecode.com/svn/trunk@14516 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed