Roll src/third_party/skia e942bee:0278197

Summary of changes available at:
https://chromium.googlesource.com/skia/+log/e942bee..0278197

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

Commits in this roll:
0278197 jvanverth@google.com Run noise shader separately in imagefiltersclipped
374b2f7 joshualitt@chromium.org rename BitmapTextBlob and move it to its own file
4ec1ac6 caryclark@google.com make xfermode* portable
9b8d358 borenet@google.com Skip imagefiltersclipped GM on Galaxy S4

Review URL: https://codereview.chromium.org/1238293003

Cr-Commit-Position: refs/heads/master@{#339674}

DEPS

@@ -34,7 +34,7 @@ vars = {
   'chromium_git': 'https://chromium.googlesource.com',
   'libvpx_revision': 'd5c834797554016ff9eee05da9f3e4c1fd4fd819',
   'sfntly_revision': '1bdaae8fc788a5ac8936d68bf24f37d977a13dac',
-  'skia_revision': 'e942bee8f9bc9b224aecc376083082c1ac33818d',
+  'skia_revision': '02781977e00d88a7b0a3bbd6de158a9f3fecfd46',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.