Roll src/third_party/skia afe3005:7729e56

Summary of changes available at:
https://chromium.googlesource.com/skia/+log/afe3005..7729e56

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

Review URL: https://codereview.chromium.org/855003004

Cr-Commit-Position: refs/heads/master@{#311937}

DEPS

@@ -42,7 +42,7 @@ vars = {
   'boringssl_git': 'https://boringssl.googlesource.com',
   'libvpx_revision': '4f9bd1b106e9e87a02ac2a0d5f9f92a6389b467d',
   'sfntly_revision': '1bdaae8fc788a5ac8936d68bf24f37d977a13dac',
-  'skia_revision': 'afe3005be3392e43bc51eb7eb2017eefaed85ad1',
+  'skia_revision': '7729e56a29a44bd47c69c8dc3247421595940acc',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.