Roll src/third_party/SPIRV-Tools/src 5081512502df..55adf4cf707b (3 commits)

https://chromium.googlesource.com/external/github.com/KhronosGroup/SPIRV-Tools.git/+log/5081512502df..55adf4cf707b


git log 5081512502df..55adf4cf707b --date=short --no-merges --format='%ad %ae %s'
2019-07-11 zoddicus@users.noreply.github.com Update execution scope rules for WebGPU (#2730)
2019-07-11 33432579+alan-baker@users.noreply.github.com Extra small storage validation (#2732)
2019-07-11 jbolz@nvidia.com Add validation for SPV_EXT_demote_to_helper_invocation (#2707)


Also rolling transitive DEPS:
  src/third_party/spirv-headers/src de99d4d834ae..123dc278f204

Created with:
  gclient setdep -r src/third_party/SPIRV-Tools/src@55adf4cf707b

The AutoRoll server is located here: https://autoroll.skia.org/r/spirv-tools-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.

CQ_INCLUDE_TRYBOTS=luci.chromium.try:android_angle_vk32_deqp_rel_ng;luci.chromium.try:android_angle_vk32_rel_ng;luci.chromium.try:android_angle_vk64_deqp_rel_ng;luci.chromium.try:android_angle_vk64_rel_ng;luci.chromium.try:linux_angle_deqp_rel_ng;luci.chromium.try:linux-angle-rel;luci.chromium.try:win-angle-rel;luci.chromium.try:win_angle_deqp_rel_ng
TBR=radial-bots+chrome-roll@google.com,cwallez@chromium.org

Change-Id: Ia1b2ab106f0a87ee40a22e547207b770ec5cf48d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1699116Reviewed-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@{#676858}

DEPS

@@ -263,11 +263,11 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'spv_tools_revision': '5081512502df32b38a38712adb0d8c1b23bb1c2e',
+  'spv_tools_revision': '55adf4cf707bb12c29fc12f784ebeaa29a819e9b',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.
-  'spv_headers_revision': 'de99d4d834aeb51dd9f099baa285bd44fd04bb3d',
+  'spv_headers_revision': '123dc278f204f8e833e1a88d31c46d0edf81d4b2',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling feed
   # and whatever else without interference from each other.