Roll src/third_party/glslang/src/ a08f465d5..0ac199df3 (8 commits)

https://chromium.googlesource.com/external/github.com/KhronosGroup/glslang.git/+log/a08f465d5398..0ac199df3268

$ git log a08f465d5..0ac199df3 --date=short --no-merges --format='%ad %ae %s'
2018-10-30 cwallez BUILD.gn: remove reference to non-existent header
2018-10-29 cwallez Fix MSVC warning C4065: 'default' but no 'case' labels
2018-10-26 cepheus Build: Pin googletest to a version that works with visual studio 2013.
2018-10-26 cepheus SPV/Standalone: Support specifying arbitrary versions of SPIR-V.
2018-10-23 neil.henning Fix 8-bit storage nearly always using the UniformAndStorageBuffer8BitAccess capability.
2018-10-25 sparmar Allow GL_NV_mesh_shader in fragment shaders for perprimitiveNV
2018-10-25 cepheus PP: Fix #155: Don't give error on HLSL PP-only parsing.
2018-10-24 dsinclair Fixup unused parameter warnings

Created with:
  roll-dep src/third_party/glslang/src
TBR=dsinclair@chromium.org

Bug: 870747
Change-Id: Iba9e47a7ed03898808a682157d92f540dc9f27a9
Reviewed-on: https://chromium-review.googlesource.com/c/1309738Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604234}

DEPS

@@ -737,7 +737,7 @@ deps = {
   },
 
   'src/third_party/glslang/src':
-    Var('chromium_git') + '/external/github.com/KhronosGroup/glslang.git' + '@' + 'a08f465d5398518e9a6aeebd4775604a4c10e381',
+    Var('chromium_git') + '/external/github.com/KhronosGroup/glslang.git' + '@' + '0ac199df32687fe17b38cd2d0da64c3742e24fef',
 
   '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'),