Roll src/third_party/skia/ 485dc868f..0cfd547b4 (5 commits)

https://skia.googlesource.com/skia.git/+log/485dc868fff7..0cfd547b465a

$ git log 485dc868f..0cfd547b4 --date=short --no-merges --format='%ad %ae %s'
2018-04-05 brianosman Remove SK_SUPPORT_LEGACY_BLURMASKFILTER
2018-04-06 bsalomon Add versions of MakeGL() that don't require include GrGLInterface.h in order to use the GrGLMakeNativeInterface
2018-04-06 egdaniel Don't use GrPixelConfig value as proxy for valid on GrBackendSurface.
2018-04-05 liyuqian Exercise the threaded backend in test bots
2018-04-06 angle-skia-autoroll Roll third_party/externals/angle2/ c3755fc56..b8e396609 (1 commit)

Created with:
  roll-dep src/third_party/skia


The AutoRoll server is located here: https://autoroll.skia.org

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel;luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
TBR=herb@chromium.org

Change-Id: I9f6d64530d85e8cf511092f02df3dc85abf8afda
Reviewed-on: https://chromium-review.googlesource.com/999733Reviewed-by: skia-chromium-autoroll <skia-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Commit-Queue: skia-chromium-autoroll <skia-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#548868}

DEPS

@@ -82,7 +82,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.
-  'skia_revision': '485dc868fff73073a40509186e4e33fbcfb0edd2',
+  'skia_revision': '0cfd547b465a3611506dc4c4c0ba973ccb2e7f30',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.