Roll Skia 1537->1552

BUG=NONE
TEST=NONE
TBR=ctguil@chromium.org

Review URL: http://codereview.chromium.org/7003072

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@88481 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -16,7 +16,7 @@ vars = {
   "libjingle_revision": "63",
   "libvpx_revision": "81610",
   "ffmpeg_revision": "83815",
-  "skia_revision": "1537",
+  "skia_revision": "1552",
   "v8_revision": "8218",
 }