Roll src/third_party/skia/ 9a9c25b36..6198f39ad (5 commits)

https://skia.googlesource.com/skia.git/+log/9a9c25b36ce5..6198f39adc5c

$ git log 9a9c25b36..6198f39ad --date=short --no-merges --format='%ad %ae %s'
2018-05-08 angle-skia-autoroll Roll third_party/externals/angle2/ 9f394f8cd..3b9b027c5 (1 commit)
2018-05-07 khushalsagar text-blob: Fix OOM issues during blob deserialization.
2018-05-07 fmalita [viewer] Avoid per-frame json UI updates
2018-05-07 bsalomon Visit the image proxy in GrLatticeOp
2018-05-07 bsalomon Add null proxy test to SkGpuDevice::drawProducerLattice

Created with:
  roll-dep src/third_party/skia
BUG=chromium:840096,chromium:b/77917978,chromium:b/77917978


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;luci.chromium.try:win_optional_gpu_tests_rel
TBR=egdaniel@chromium.org

Change-Id: I73084b62ba69340f17f0f9e7d801e2558c198599
Reviewed-on: https://chromium-review.googlesource.com/1049116Reviewed-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@{#556707}

DEPS

@@ -96,7 +96,7 @@ 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': '9a9c25b36ce50f266ae9ec6ec9b06d9465cd3924',
+  'skia_revision': '6198f39adc5cc935c10371d886aa995cc7d5dce3',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.