Report 2 digit floating point failing rate percentage.

BUG=None
NOTRY=true

Review URL: https://codereview.chromium.org/37923002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230570 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230570