Roll src/third_party/shaderc/src 942aa55afa1d..7be1d2e25417 (1 commits)

https://chromium.googlesource.com/external/github.com/google/shaderc/+log/942aa55afa1d..7be1d2e25417

git log 942aa55afa1d..7be1d2e25417 --date=short --no-merges --format='%ad %ae %s'
2019-11-15 rharrison@google.com Add access to MSL options needed by Dawn (#893)

Created with:
  gclient setdep -r src/third_party/shaderc/src@7be1d2e25417

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

TBR=radial-bots+chrome-roll@google.com

Bug: None
Change-Id: I9c51ae26ea32ecc290b10ebc16ce3ce484220c83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918428Reviewed-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@{#715770}

DEPS

@@ -303,7 +303,7 @@ 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': '942aa55afa1d72bc0c832daa9d4f806f248ee712',
+  'shaderc_revision': '7be1d2e254172f6d1426090ed87a376fa5a11936',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.