Roll src/third_party/glslang/src 4b97a1108114..1ff0c181bb37 (1 commits)

https://chromium.googlesource.com/external/github.com/KhronosGroup/glslang/+log/4b97a1108114..1ff0c181bb37

git log 4b97a1108114..1ff0c181bb37 --date=short --no-merges --format='%ad %ae %s'
2019-10-10 cepheus@frii.com Fix #1924: Emit SPV_EXT_physical_storage_buffer, not the KHR form.

Created with:
  gclient setdep -r src/third_party/glslang/src@1ff0c181bb37

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

Bug: None
Change-Id: I1bbc767068622b1a0bb4a3c5d268f9641b34ce39
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1853565Reviewed-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@{#704785}

DEPS

@@ -956,7 +956,7 @@ deps = {
   },
 
   'src/third_party/glslang/src':
-    Var('chromium_git') + '/external/github.com/KhronosGroup/glslang.git' + '@' + '4b97a1108114107a8082a55e9e0721a40f9536d3',
+    Var('chromium_git') + '/external/github.com/KhronosGroup/glslang.git' + '@' + '1ff0c181bb37b06371e2ffa2810d473c5e01c9b7',
 
   'src/third_party/google_toolbox_for_mac/src': {
       'url': Var('chromium_git') + '/external/github.com/google/google-toolbox-for-mac.git' + '@' + Var('google_toolbox_for_mac_revision'),