roll skia DEPS to 12926

This CL was created by Skia's roll_deps.py script.

control: https://codereview.chromium.org/102113007

R=rmistry@google.com

Review URL: https://codereview.chromium.org/119313004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243296 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243296