Skia DEPS roll 3100->3124

Review URL: https://chromiumcodereview.appspot.com/9315005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@120068 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -36,7 +36,7 @@ vars = {
   "lss_revision": "9",
   "ffmpeg_revision": "119698",
   "sfntly_revision": "118",
-  "skia_revision": "3100",
+  "skia_revision": "3125",
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.