Roll src/third_party/skia 451e822:912ed6e

Summary of changes available at:
https://chromium.googlesource.com/skia/+log/451e822..912ed6e

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

Review URL: https://codereview.chromium.org/804833003

Cr-Commit-Position: refs/heads/master@{#308302}

DEPS

@@ -44,7 +44,7 @@ vars = {
   'boringssl_git': 'https://boringssl.googlesource.com',
   'libvpx_revision': 'd3f3dcefb055656807e8a2f65a322bbb13cd05a4',
   'sfntly_revision': '1bdaae8fc788a5ac8936d68bf24f37d977a13dac',
-  'skia_revision': '451e822705174c8fe9f5b172c8783d9be3c4c79c',
+  'skia_revision': '912ed6ebb8e2813e72ed7a3dec3b6710ba7e7405',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.