Roll src/third_party/glslang/src 34cccdc65d79..4b97a1108114 (32 commits)

https://chromium.googlesource.com/external/github.com/KhronosGroup/glslang/+log/34cccdc65d79..4b97a1108114

git log 34cccdc65d79..4b97a1108114 --date=short --no-merges --format='%ad %ae %s'
2019-10-07 johnkslang@users.noreply.github.com Merge pull request #1919 from dj2/install_spirv
2019-10-03 johnkslang@users.noreply.github.com Merge pull request #1918 from KhronosGroup/format-attributes
2019-09-25 johnkslang@users.noreply.github.com Merge pull request #1906 from ShchchowAMD/master
2019-09-20 johnkslang@users.noreply.github.com Merge pull request #1910 from KhronosGroup/fix-1900-const-nonuniform
2019-09-19 johnkslang@users.noreply.github.com Merge pull request #1907 from kainino0x/separate-web-and-emscripten
2019-09-19 johnkslang@users.noreply.github.com Merge pull request #1905 from KhronosGroup/GL_EXT_buffer_reference_uvec2
2019-09-18 johnkslang@users.noreply.github.com Merge pull request #1908 from digit-google/fuchsia-fixes
2019-09-18 cepheus@frii.com README: Fix WASM typos.
2019-09-18 cepheus@frii.com HLSL: Fix #1903 Catch 0-argument case to constructors.
2019-09-18 johnkslang@users.noreply.github.com Merge pull request #1902 from jeffbolznv/extended_types
2019-09-16 johnkslang@users.noreply.github.com Merge pull request #1899 from KhronosGroup/SPIR-V_1.5
2019-09-16 johnkslang@users.noreply.github.com Merge pull request #1894 from ShchchowAMD/master
2019-09-12 johnkslang@users.noreply.github.com Merge pull request #1897 from dj2/unused
2019-09-11 johnkslang@users.noreply.github.com Merge pull request #1895 from amdrexu/bugfix
2019-09-05 cepheus@frii.com Fix #1879: Check for valid variable before checking for unsized arrays.
2019-09-05 johnkslang@users.noreply.github.com Merge pull request #1892 from greg-lunarg/kg106
2019-09-03 johnkslang@users.noreply.github.com Merge pull request #1889 from Roy-AMD/code-refine
2019-08-30 cepheus@frii.com Placeholder fix for part of #1870.
2019-08-30 cepheus@frii.com Non-functional: Make whitespace/braces consistent for a recent commit.
2019-08-29 johnkslang@users.noreply.github.com Merge pull request #1885 from zoddicus/fixUnInitializedVariableWarnings
2019-08-28 johnkslang@users.noreply.github.com Merge pull request #1876 from jeffbolznv/imma
2019-08-28 cepheus@frii.com ESSL/SPV: Fix #1856: Allow ESSL shaders to compile to OpenGL SPIR-V.
2019-08-28 cepheus@frii.com Documentation: Provide more detail in setting up the environment.
2019-08-27 johnkslang@users.noreply.github.com Merge pull request #1883 from Kangz/fix_gn
2019-08-27 johnkslang@users.noreply.github.com Merge pull request #1881 from baldurk/buffer-array-bind-reflection-fix
2019-08-26 johnkslang@users.noreply.github.com Merge pull request #1882 from Kangz/fix-chrome
2019-08-26 johnkslang@users.noreply.github.com Merge pull request #1878 from dneto0/chrome-fix
2019-08-22 cepheus@frii.com Bump revision.
2019-08-22 johnkslang@users.noreply.github.com Merge pull request #1874 from KhronosGroup/inherit-memory-qualifiers
2019-08-22 johnkslang@users.noreply.github.com Merge pull request #1875 from jonahryandavis/extra-tokens
2019-08-21 cepheus@frii.com Bump version.
2019-08-21 johnkslang@users.noreply.github.com Merge pull request #1855 from KhronosGroup/web

Created with:
  gclient setdep -r src/third_party/glslang/src@4b97a1108114

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: Ia35e07d16f2adfc46bce3b5a581fb4bade2f8315
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1844121Reviewed-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@{#703380}

DEPS

@@ -956,7 +956,7 @@ deps = {
   },
 
   'src/third_party/glslang/src':
-    Var('chromium_git') + '/external/github.com/KhronosGroup/glslang.git' + '@' + '34cccdc65d79fda20fa7a3eac271add45493cacb',
+    Var('chromium_git') + '/external/github.com/KhronosGroup/glslang.git' + '@' + '4b97a1108114107a8082a55e9e0721a40f9536d3',
 
   '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'),