Skia roll 294739b:937c9c7

https://skia.googlesource.com/skia/+log/294739b848c7103afa92390855175dd0bd1cc2d8..937c9c7eb4e06d4d3bc495e129c7b8103a5d6c0f

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

Review URL: https://codereview.chromium.org/531393002

Cr-Commit-Position: refs/heads/master@{#293084}

DEPS

@@ -38,7 +38,7 @@ vars = {
   # to update other nacl_*_revision's.
   'libvpx_revision': '982d14793a8e42d2fa5e6e5e34bede17b4ba67e3', # r291730
   'sfntly_revision': '1bdaae8fc788a5ac8936d68bf24f37d977a13dac',
-  'skia_revision': '294739b848c7103afa92390855175dd0bd1cc2d8',
+  'skia_revision': '937c9c7eb4e06d4d3bc495e129c7b8103a5d6c0f',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.