Roll src/third_party/skia 13f701a:5f6094a

Summary of changes available at:
https://chromium.googlesource.com/skia/+log/13f701a..5f6094a

CQ_EXTRA_TRYBOTS=tryserver.blink:linux_blink_rel,linux_blink_dbg
TBR=hcm@google.com

Review URL: https://codereview.chromium.org/679973004

Cr-Commit-Position: refs/heads/master@{#301443}

DEPS

@@ -44,7 +44,7 @@ vars = {
   'boringssl_git': 'https://boringssl.googlesource.com',
   'libvpx_revision': '2e5ced5fd62a73f4f5687ab19520b3aad1c53f6f',
   'sfntly_revision': '1bdaae8fc788a5ac8936d68bf24f37d977a13dac',
-  'skia_revision': '13f701a14d2a303b153ea861a3482e25254a9c3c',
+  'skia_revision': '5f6094a1eb9bf5bb9fd17ada84a5763de2853eff',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.