Fixes 1 pixel shift of text rendering on CrOS and Linux.

For those platform which don't support cap height, we should center the entire font height instead of the cap height.  This CL applies the same fix as http://crrev.com/59873002 .

BUG=314688
TBR=asvitkine,msw
TEST=Test manually.

Review URL: https://codereview.chromium.org/66723009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234137 0039d316-1c4b-4281-b951-d872f2087c98
telemetry: Re-enable smoothness.tough_canvas_cases with reduced page-set.

- excluding single_image and many_image pages that fail on the N10.

R=tonyg@chromium.org
BUG=314380
NOTRY=True

Review URL: https://codereview.chromium.org/66933004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234138 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234138