Clang: Roll skia to 583.

See http://code.google.com/p/skia/source/detail?r=583

TBR=evanm

Review URL: http://codereview.chromium.org/2823032

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@50946 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -3,7 +3,7 @@ vars = {
   "http://svn.webkit.org/repository/webkit/trunk",
   "webkit_revision": "61900",
   "ffmpeg_revision": "49485",
-  "skia_revision": "582",
+  "skia_revision": "583",
   "chromium_git": "http://src.chromium.org/git",
   "swig_revision": "40423",
   "nacl_revision": "2555",