Roll Skia from b5d30dc4142c to 16d86135b739 (7 revisions)

https://skia.googlesource.com/skia.git/+log/b5d30dc4142c..16d86135b739

2020-12-28 bsalomon@google.com Make textures used with alpha-only color-types produce 0s for RGB
2020-12-28 bsalomon@google.com Add GrPixmap. Like SkPixmap but uses GrColorType.
2020-12-28 bungeman@google.com Make onCreateScalerContext return unique_ptr.
2020-12-28 fmalita@chromium.org Add explicit int -> size_t casts to SkTDArray.h
2020-12-28 csmartdalton@google.com Avoid uninitialized values in strokeIndirect SIMD queues
2020-12-28 johnstiles@google.com Detect and report numeric overflows in the SkSL parser.
2020-12-28 egdaniel@google.com Fix vk framebuffer attachment views to only have 1 mip level.

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 djsollen@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: djsollen@google.com
Change-Id: I5ddc6e9f9919c668bc16320d575f76f988265208
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2605435Reviewed-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@{#839489}

DEPS

@@ -199,7 +199,7 @@ 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': 'b5d30dc4142c13a06838de8d2dbb623592590d92',
+  'skia_revision': '16d86135b739bc89ec4744bcec3eccc590c433ba',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.