Rolling Skia DEPS from 2721 to 2728

DEPS

 vars = {
   # Use this googlecode_url variable only if there is an internal mirror for it.
   # If you do not know, use the full path while defining your new deps entry.
   "googlecode_url": "http://%s.googlecode.com/svn",
   "sourceforge_url": "http://%(repo)s.svn.sourceforge.net/svnroot/%(repo)s",
   "webkit_trunk": "http://svn.webkit.org/repository/webkit/trunk",
   "nacl_trunk": "http://src.chromium.org/native_client/trunk",
   "webkit_revision": "100977",
   "chromium_git": "http://git.chromium.org/git",
   "swig_revision": "69281",
@@ skipping 10 matching lines @@
   "nacl_toolchain_win_x86_newlib_hash":
       "3672e7b20848beec886badc46909cf24fb1c574f",
   "nacl_toolchain_linux_x86_newlib_hash":
       "528b9b85d087ffb5a0f6348f5219a33cd0ff725f",
   "nacl_toolchain_revision": "7098",
 
   "libjingle_revision": "95",
   "libvpx_revision": "109236",
   "ffmpeg_revision": "109946",
   "sfntly_revision": "98",
-  "skia_revision": "2721",
+  "skia_revision": "2728",
   "v8_revision": "10037",
   "webrtc_revision": "946",
   "jsoncpp_revision": "246",
 }
 
 deps = {
   "src/breakpad/src":
     (Var("googlecode_url") % "google-breakpad") + "/trunk/src@886",
 
   "src/build/util/support":
@@ skipping 394 matching lines @@
     # which takes ~20s, but clang speeds up builds by more than 20s.
     "pattern": ".",
     "action": ["python", "src/tools/clang/scripts/update.py", "--mac-only"],
   },
   {
     # A change to a .gyp, .gypi, or to GYP itself should run the generator.
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
 ]