Skia roll 6dcccc4:87c4138

https://skia.googlesource.com/skia/+log/6dcccc476bddd4ccba69491f6a87eed68e581414..87c4138fae37ba6b7e4de7acc3fce19524d726ea

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

Review URL: https://codereview.chromium.org/552653004

Cr-Commit-Position: refs/heads/master@{#293735}

DEPS

@@ -35,7 +35,7 @@ vars = {
   'boringssl_git': 'https://boringssl.googlesource.com',
   'libvpx_revision': 'ceebbcc0cef1bbd2bb672576ccf1133168639346', # r291805
   'sfntly_revision': '1bdaae8fc788a5ac8936d68bf24f37d977a13dac',
-  'skia_revision': '6dcccc476bddd4ccba69491f6a87eed68e581414',
+  'skia_revision': '87c4138fae37ba6b7e4de7acc3fce19524d726ea',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.