Roll src/third_party/skia 8d6aa1a2a00d..f18c297cfb74 (3 commits)

https://skia.googlesource.com/skia.git/+log/8d6aa1a2a00d..f18c297cfb74


git log 8d6aa1a2a00d..f18c297cfb74 --date=short --no-merges --format='%ad %ae %s'
2018-09-25 egdaniel@google.com Revert "Add support for RGB config to Vulkan."
2018-09-25 robertphillips@google.com Add SkImage_Gpu::MakePromiseYUVATexture
2018-09-25 herb@google.com Extract code common to Renderer and GPU for Fallback


Created with:
  gclient setdep -r src/third_party/skia@f18c297cfb74

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

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=luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux-chromeos-compile-dbg;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
TBR=bsalomon@chromium.org

Change-Id: Ic68c5da4e46d14019c2d5a884db297d4dae26951
Reviewed-on: https://chromium-review.googlesource.com/1244161
Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#594099}

DEPS

@@ -105,7 +105,7 @@ 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': '8d6aa1a2a00d11cf9082e43ceae396db5adee66b',
+  'skia_revision': 'f18c297cfb74a48b748bc7909991f98dabb8d460',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.