Update Alligned Rect Shader to match geometry version

-Also update to combine width and height coverage using multiplication
 instead of using min

R=bsalomon@google.com, robertphillips@google.com

Author: egdaniel@google.com

Review URL: https://chromiumcodereview.appspot.com/16854012

git-svn-id: http://skia.googlecode.com/svn/trunk@9609 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed