Roll src/third_party/skia b500ffa:726cf90

Summary of changes available at:
https://chromium.googlesource.com/skia/+log/b500ffa..726cf90

CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
TBR=caryclark@google.com

Review URL: https://codereview.chromium.org/1154023003

Cr-Commit-Position: refs/heads/master@{#333176}

DEPS

@@ -42,7 +42,7 @@ vars = {
   'boringssl_git': 'https://boringssl.googlesource.com',
   'libvpx_revision': 'a43631169b4200f2000c8cfa82404ce507e31486',
   'sfntly_revision': '1bdaae8fc788a5ac8936d68bf24f37d977a13dac',
-  'skia_revision': 'b500ffa1a253dca35a7ff846ebece9fe570e3565',
+  'skia_revision': '726cf9038aae3f4dffc79a97645388f32224b22d',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.