Roll glslang from 27e915ed4f20 to dca47063ccd2 (2 revisions)

https://chromium.googlesource.com/external/github.com/KhronosGroup/glslang/+log/27e915ed4f20..dca47063ccd2

2020-06-30 johnkslang@users.noreply.github.com Merge pull request #2295 from ben-clayton/rm-old-kokoro-cfgs
2020-06-30 johnkslang@users.noreply.github.com Merge pull request #2292 from proydakov/gcc-unused-parameter

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
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Change-Id: Idf18ad63fc8457b25c8078aeee9e44f5614fd2ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2275579Reviewed-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@{#783841}

DEPS

@@ -937,7 +937,7 @@ deps = {
     Var('chromium_git') + '/codecs/libgav1.git' + '@' + 'bf190c43e5c7cc81751867c917a81bc2920be079',
 
   'src/third_party/glslang/src':
-    Var('chromium_git') + '/external/github.com/KhronosGroup/glslang.git' + '@' + '27e915ed4f208cf0913425c79b1e62ffe80a6299',
+    Var('chromium_git') + '/external/github.com/KhronosGroup/glslang.git' + '@' + 'dca47063ccd29e5cea8e88dc38a6369d4c2e5c11',
 
   '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'),