roll skia DEPS to 12846

BUG=
R=fmalita@chromium.org

Review URL: https://codereview.chromium.org/118873003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242765 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242766 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242766