Roll src/third_party/shaderc/src 4bb7b1ddf3b1..99ca03e1ac3a (1 commits)

https://chromium.googlesource.com/external/github.com/google/shaderc/+log/4bb7b1ddf3b1..99ca03e1ac3a

git log 4bb7b1ddf3b1..99ca03e1ac3a --date=short --first-parent --format='%ad %ae %s'
2020-01-14 rharrison@google.com Convert get_shader_resources to return ptr instead of ref (#955)

Created with:
  gclient setdep -r src/third_party/shaderc/src@99ca03e1ac3a

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/shaderc-chromium-autoroll
Please CC radial-bots+chrome-roll@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

Bug: None
Tbr: radial-bots+chrome-roll@google.com
Change-Id: I41afabe4fb79e397e1b4baaed99c9864a2246764
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2001640Reviewed-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@{#731766}

DEPS

@@ -308,7 +308,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'shaderc_revision': '4bb7b1ddf3b12aa3ad80fa63ccf4afe87e0e6987',
+  'shaderc_revision': '99ca03e1ac3a78c7d0e1ca7b3a1f6d973e0c1fc7',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.