change tooBitForLCD to compare against linear size of the text, not the area

BUG=skia:
R=bungeman@google.com, alokp@google.com

Author: reed@google.com

Review URL: https://codereview.chromium.org/200643003

git-svn-id: http://skia.googlecode.com/svn/trunk@13817 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed