Roll src/third_party/skia e27a503a0a21..2579de4567d5 (3 commits)

https://skia.googlesource.com/skia.git/+log/e27a503a0a21..2579de4567d5

git log e27a503a0a21..2579de4567d5 --date=short --no-merges --format='%ad %ae %s'
2019-10-09 robertphillips@google.com Tighten up creation of the GrProgramDesc and remove some unnecessary checks
2019-10-09 kjlubick@google.com [canvaskit] Update to build with emscripten 1.38.47
2019-10-09 bungeman@google.com Retain hints when subsetting for PDF.

Created with:
  gclient setdep -r src/third_party/skia@2579de4567d5

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 kjlubick@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=kjlubick@google.com

Bug: chromium:1010396
Change-Id: Ibaab7478618e595bb635c1742a31defd34b185b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1849180Reviewed-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@{#704280}

DEPS

@@ -167,7 +167,7 @@ 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': 'e27a503a0a21af167e6a19d2e5c7b7e1039964bf',
+  'skia_revision': '2579de4567d5f2eee454f782fe8287d696181157',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.