Constify the arguments to createTexture

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

Author: krajcevski@google.com

Review URL: https://codereview.chromium.org/301993002

git-svn-id: http://skia.googlecode.com/svn/trunk/include@14975 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed