Reland "Vulkan: Build validation layers with asserts only"

This reverts commit d187d45ede.

Reason for revert: The correct thing to revert was https://chromium-review.googlesource.com/c/chromium/src/+/1657512

Original change's description:
> Revert "Vulkan: Build validation layers with asserts only"
> 
> This reverts commit 85fef1bc62.
> 
> Reason for revert: This actually seems to break the fucshia_x64 bot:
> 
> Exception: Some files were excluded with --exclude-file, but not found in the deps list: lib/libVkLayer_parameter_validation.so, lib/libVkLayer_core_validation.so
> 
> See https://analysis.chromium.org/waterfall/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyRAsSDVdmU3VzcGVjdGVkQ0wiMWNocm9taXVtLzk0ODYyNWNjNDE2NmE3NjRkYWM2NTRlNjlmZDA3MGFjMDE3MzNkNTMM
> 
> Original change's description:
> > Vulkan: Build validation layers with asserts only
> > 
> > Adding ANGLE to the build includes the validation layers, which are only
> > for development. We don't want any development or debugging code to be
> > included by default in release builds, so tie building the validation
> > layers to enablement of asserts.
> > 
> > Bug: angleproject:2475
> > Test: gn gen out/fuchsia_rel --args='target_os="fuchsia" is_debug=false use_goma=true'
> >   gn desc out/fuchsia_rel //fuchsia/engine:web_engine runtime_deps
> > 
> > Change-Id: I6d195c680255dcbc81e95f8e6f80e1e8ace169a2
> > Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1656306
> > Reviewed-by: Jamie Madill <jmadill@chromium.org>
> > Commit-Queue: Michael Spang <spang@chromium.org>
> 
> TBR=spang@chromium.org,geofflang@chromium.org,jmadill@chromium.org
> 
> Change-Id: Ia74efcce2b3dda02dc0c0d292bdeb5ea7c5c3530
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: angleproject:2475
> Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1657711
> Reviewed-by: Jamie Madill <jmadill@chromium.org>
> Commit-Queue: Jamie Madill <jmadill@chromium.org>

TBR=spang@chromium.org,geofflang@chromium.org,jmadill@chromium.org

Change-Id: Iab669210c23823b403e3fff7f5199a7aadd032bb
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: angleproject:2475
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1658411
Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>

gni/angle.gni

@@ -77,7 +77,8 @@ declare_args() {
 
   # Disable the layers in ubsan builds because of really slow builds.
   angle_enable_vulkan_validation_layers =
-      angle_enable_vulkan && !is_ubsan && !is_tsan && !is_asan
+      angle_enable_vulkan && !is_ubsan && !is_tsan && !is_asan &&
+      (is_debug || dcheck_always_on)
 
   if (angle_enable_vulkan) {
     # Enable Vulkan GPU trace event capability