Roll Skia DEPS to r12906

DEPS

 # This file is automatically processed to create .DEPS.git which is the file
 # that gclient uses under git.
 #
 # See http://code.google.com/p/chromium/wiki/UsingGit
 #
 # To test manually, run:
 #   python tools/deps2git/deps2git.py -o .DEPS.git
 #   gclient runhooks
 # DO NOT CHECK IN CHANGES TO .DEPS.git. It will be automatically updated by
 # a bot when you modify this one.
@@ skipping 26 matching lines @@
   "libvpx_revision": "241571",
   "lss_revision": "24",
 
   # These two FFmpeg variables must be updated together.  One is used for SVN
   # checkouts and the other for Git checkouts.
   "ffmpeg_revision": "242831",
   "ffmpeg_hash": "0b461999804771144964b14bd86a0be885ff7d48",
 
   "sfntly_revision": "228",
   "lighttpd_revision": "33737",
-  "skia_revision": "12875",
-  "skia_hash": "862020763d9d2fb1900b2c84e55dadf46482246d",
+  "skia_revision": "12906",
+  "skia_hash": "ba82bd11e2c055f885b2327aa230d2dac8b53f03",
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.
   "v8_revision": "18437",
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling WebRTC
   # and V8 without interference from each other.
   "webrtc_revision": "5300",
   "jsoncpp_revision": "248",
   "nss_revision": "239365",
@@ skipping 652 matching lines @@
     "pattern": ".",
     "action": ["python", "src/build/gyp_chromium"],
   },
   {
     # Check for landmines (reasons to clobber the build).
     "name": "landmines",
     "pattern": ".",
     "action": ["python", "src/build/landmines.py"],
   },
 ]