Adding smoothness.tough_canvas_cases to the list of benchmarks monitored on the perf dashboard.

BUG=257212

Review URL: https://codereview.chromium.org/139613006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246949 0039d316-1c4b-4281-b951-d872f2087c98
Removes a spurious space

Removes a spurious space

R=oshima@chromium.org
TBR=oshima@chromium.org
BUG=none
TEST=none

Review URL: https://codereview.chromium.org/145173008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246950 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246949
SVN changes up to revision 246950