Present separate indicators of experimental test failures on dash pages.

Summary dash: If experimental bvt tests are run and any fail, the summary page
              will show a secondary count of experimental pass/total.
              If all experimental tests run pass or none are run, there is no
              indication on the summary.
              Popups elaborate on which failed tests were experimental.
Details pages: Experimental tests are marked as pink. They were not displayed
               previously.

BUG=chromium-os:33884
TEST=http://truty.i/results/dashboard/waterfall_index.html
TEST=http://truty.i/results/dashboard/zgb/x86-zgb-r23/bvt.html

Change-Id: I64399590b3d0560169d699100aab01d259c0c807
Reviewed-on: https://gerrit.chromium.org/gerrit/35468
Reviewed-by: Danielle Drew <ddrew@chromium.org>
Tested-by: Danielle Drew <ddrew@chromium.org>
Commit-Ready: Danielle Drew <ddrew@chromium.org>
7 files changed