Skia roll f5b6bf7:ef53f15

https://skia.googlesource.com/skia/+log/f5b6bf775c331784964bfcc9b9ac707dc6a7c62b..ef53f158de34ffaebd6537f1afd4adf38717987d

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

Review URL: https://codereview.chromium.org/555303002

Cr-Commit-Position: refs/heads/master@{#294033}

DEPS

@@ -35,7 +35,7 @@ vars = {
   'boringssl_git': 'https://boringssl.googlesource.com',
   'libvpx_revision': 'd95585fb0ec024f6abd96f7b02e0df58019d46af', # r291859
   'sfntly_revision': '1bdaae8fc788a5ac8936d68bf24f37d977a13dac',
-  'skia_revision': 'f5b6bf775c331784964bfcc9b9ac707dc6a7c62b',
+  'skia_revision': 'ef53f158de34ffaebd6537f1afd4adf38717987d',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and V8 without interference from each other.