Add f suffix to 0.5 to fix mac 10.6 warning

BUG=skia:2195

Review URL: https://codereview.chromium.org/172233004

git-svn-id: http://skia.googlecode.com/svn/trunk@13500 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed