Roll src/third_party/glslang/src d579c0a7d45a..a9b00ac5d588 (2 commits)

https://chromium.googlesource.com/external/github.com/KhronosGroup/glslang/+log/d579c0a7d45a..a9b00ac5d588


git log d579c0a7d45a..a9b00ac5d588 --date=short --no-merges --format='%ad %ae %s'
2019-06-18 johnkslang@users.noreply.github.com Merge pull request #1806 from KhronosGroup/nan-clamp
2019-06-18 johnkslang@users.noreply.github.com Merge pull request #1698 from jeffbolznv/private_storage_variables


Created with:
  gclient setdep -r src/third_party/glslang/src@a9b00ac5d588

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,jonahr@google.com

Change-Id: I57cc0a084d927f0a82c4912b738c31a957fcf6b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1662954
Reviewed-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@{#670001}