make new blurrect GM and replace the dozens of existing ones

BUG=
NOTRY=True
R=reed@google.com, epoger@google.com

Author: humper@google.com

Review URL: https://codereview.chromium.org/306583007

git-svn-id: http://skia.googlecode.com/svn/trunk@14940 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed