Roll Skia from fafb47739a31 to 2a735ba1cb32 (6 revisions)

https://skia.googlesource.com/skia.git/+log/fafb47739a31..2a735ba1cb32

2021-01-08 mtklein@google.com add colorspace2 GM
2021-01-08 mtklein@google.com quiet dehyrdate_sksl unless it fails
2021-01-08 reed@google.com Check for null image before querying its bounds
2021-01-08 ethannicholas@google.com Add SkSL DSLType
2021-01-08 senorblanco@chromium.org Pre-emptive fix for upcoming ANGLE change.
2021-01-08 egdaniel@google.com Enable using discardable msaa attachments in vulkan.

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 johnstiles@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: johnstiles@google.com
Change-Id: I47e146b9e4658d7db89729e4746ace1da4076197
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2618085Reviewed-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@{#841637}

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': 'fafb47739a3124ba32da423c541207aa2e5cbec3',
+  'skia_revision': '2a735ba1cb32d7688c73845e92cbc2173a3b98e4',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.