Roll src/third_party/skia c7a8df8b1cdb..549325c87e9d (5 commits)

https://skia.googlesource.com/skia.git/+log/c7a8df8b1cdb..549325c87e9d

git log c7a8df8b1cdb..549325c87e9d --date=short --no-merges --format='%ad %ae %s'
2019-10-30 egdaniel@google.com Have GrTextureOp use GrSurfaceProxyViews instead of just proxys.
2019-10-30 herb@google.com Remove unused API
2019-10-30 brianosman@google.com Use SkYUVMath in asyncRescaleAndReadPixelsYUV420
2019-10-30 hop2deep@gmail.com build: fix compilation on macOS with 10.14 SDK
2019-10-30 brianosman@google.com Print out a warning if trying to use a cross context image on two contexts

Created with:
  gclient setdep -r src/third_party/skia@549325c87e9d

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-autoroll
Please CC jcgregorio@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

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

CQ_INCLUDE_TRYBOTS=luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux-blink-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
TBR=jcgregorio@google.com

Bug: chromium:none
Change-Id: I267d238ed4fc2dd2183b36acca366a5429dc29d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1891551Reviewed-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@{#711075}

DEPS

@@ -172,7 +172,7 @@ 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': 'c7a8df8b1cdbc63a1ac2ceceb91f59db5a963272',
+  'skia_revision': '549325c87e9daecffe445226773ed3fac4721622',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.