Roll src/third_party/skia/ 830c91362..50ce1f28f (1 commit).

https://chromium.googlesource.com/skia.git/+log/830c913625ac..50ce1f28ffed

$ git log 830c91362..50ce1f28f --date=short --no-merges --format='%ad %ae %s'
2016-07-29 msarett Add color space xform support to SkJpegCodec (includes F16!)

CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel
TBR=tomhudson@google.com

Review-Url: https://codereview.chromium.org/2196733002
Cr-Commit-Position: refs/heads/master@{#408642}

DEPS

@@ -36,7 +36,7 @@ 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': '830c913625ac62b16b09cc0f1dbd8f177ec493d9',
+  'skia_revision': '50ce1f28ffede3fa3e38d330d4114ee52b387848',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.