Roll src/third_party/skia/ 53c5d5fb7..222b30d3a (4 commits).

https://chromium.googlesource.com/skia.git/+log/53c5d5fb795f..222b30d3a84b

$ git log 53c5d5fb7..222b30d3a --date=short --no-merges --format='%ad %ae %s'
2015-12-03 kjlubick Make building with clang documentation a bit easier to find
2015-12-03 egdaniel Create GLSLUniformHandler class for gpu backend
2015-12-03 jvanverth Add transfer buffer support.
2015-12-03 fmalita Don't use the Sk4f gradient impl without SIMD

CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
TBR=scroggo@google.com

Review URL: https://codereview.chromium.org/1498883002

Cr-Commit-Position: refs/heads/master@{#363022}

DEPS

@@ -39,7 +39,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.
-  'skia_revision': '53c5d5fb795fe04bec050c0583223027c25b839b',
+  'skia_revision': '222b30d3a84b29b72b32e639751db4e6542d5e48',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.