Roll Skia from a551fd288101 to 7b46300fe4ff (3 revisions)

https://skia.googlesource.com/skia.git/+log/a551fd288101..7b46300fe4ff

2020-09-01 johnstiles@google.com Move ownership of SkSL::Inliner to SkSL::Compiler.
2020-09-01 johnstiles@google.com Replace salting process in SkSLInliner with a symbol table check.
2020-09-01 johnstiles@google.com Update contains_xxxx_break to use ProgramVisitor.

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 michaelludwig@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: michaelludwig@google.com
Change-Id: I762b76d1b5e2bc0b6b38387a7d3ff504098e22dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2387949Reviewed-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@{#803520}

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': 'a551fd288101fe082fb9fde12a21fbb0b9765d03',
+  'skia_revision': '7b46300fe4ff4603c269093601e2779e36f71c88',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.