Roll src/third_party/skia 00a138c:29c857d

Summary of changes available at:
https://chromium.googlesource.com/skia/+log/00a138c..29c857d

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

Review URL: https://codereview.chromium.org/588053002

Cr-Commit-Position: refs/heads/master@{#295908}

DEPS

@@ -35,7 +35,7 @@ vars = {
   'boringssl_git': 'https://boringssl.googlesource.com',
   'libvpx_revision': '42ddeba4a7ad6382898ef2e57dc4bd9f9da57aca',
   'sfntly_revision': '1bdaae8fc788a5ac8936d68bf24f37d977a13dac',
-  'skia_revision': '00a138c542bec58cac1a2ecc32b08c8312063ae5',
+  'skia_revision': '29c857d0f3a1cb837f73406eeb6ba9771879b5e7',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.