Roll Skia from 5edf510941a3 to 49983ef4e7de (2 revisions)

https://skia.googlesource.com/skia.git/+log/5edf510941a3..49983ef4e7de

2020-08-11 brianosman@google.com Runtime effect: Gather uniforms in one pass
2020-08-11 jvanverth@google.com MSAA improvements for Direct3D.

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 fmalita@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/+doc/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
Cq-Do-Not-Cancel-Tryjobs: true
Bug: None
Tbr: fmalita@google.com
Change-Id: Ie8779aa37fed168e1549ddec4c253ca0c10c867e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2348282Reviewed-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@{#796900}

DEPS

@@ -195,7 +195,7 @@ 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': '5edf510941a34cab78d5e13f26b11469312c24a8',
+  'skia_revision': '49983ef4e7deb15a8023223c24eca5685fec972a',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.