Roll src/third_party/glslang/src a549bb817523..2f4a8dfd3a59 (2 commits)

https://chromium.googlesource.com/external/github.com/KhronosGroup/glslang/+log/a549bb817523..2f4a8dfd3a59


git log a549bb817523..2f4a8dfd3a59 --date=short --no-merges --format='%ad %ae %s'
2019-06-04 johnkslang@users.noreply.github.com Merge pull request #1788 from jeffbolznv/ifdef_fix
2019-06-04 johnkslang@users.noreply.github.com Merge pull request #1786 from jeffbolznv/fsi


Created with:
  gclient setdep -r src/third_party/glslang/src@2f4a8dfd3a59

The AutoRoll server is located here: https://autoroll.skia.org/r/glslang-chromium-autoroll

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


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

Change-Id: Ie4d673b4081ac29d8a9510a5a334065c3add8e1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1643318Reviewed-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@{#665966}

DEPS

@@ -901,7 +901,7 @@ deps = {
   },
 
   'src/third_party/glslang/src':
-    Var('chromium_git') + '/external/github.com/KhronosGroup/glslang.git' + '@' + 'a549bb81752365526f6d7334f00961ea08689211',
+    Var('chromium_git') + '/external/github.com/KhronosGroup/glslang.git' + '@' + '2f4a8dfd3a596d75e3c26cb7ae9b68886d3a19cf',
 
   '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'),