kokoro: disable GLSL e2e tests on Windows Debug builds

The e2e tests are taking too long on Windows Debug builds, with GLSL
reporting 3.5 hours of total runtime. Let's disable this for now until
we fix it.

Bug: tint:2034
Change-Id: Icdb0131f93ac967728172c050b0adbe755046a7a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/149920
Reviewed-by: dan sinclair <dsinclair@chromium.org>
Commit-Queue: Antonio Maiorano <amaiorano@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
diff --git a/infra/kokoro/windows/build.bat b/infra/kokoro/windows/build.bat
index e3b2670..51c21d6 100644
--- a/infra/kokoro/windows/build.bat
+++ b/infra/kokoro/windows/build.bat
@@ -156,7 +156,13 @@
 rem Run tests with DXC, FXC and Metal validation
 set OLD_PATH=%PATH%
 set PATH=C:\Program Files\Metal Developer Tools\macos\bin;%PATH%
-call git bash -- ./test/tint/test-all.sh %BUILD_DIR%/tint.exe --verbose || goto :error
+if "%BUILD_TYPE%" == "Debug" (
+    rem TODO(crbug.com/2034): Add back glsl once we fix the ~7x slowdown in Windows Debug builds
+    set TEST_ALL_FORMATS=wgsl,spvasm,msl,hlsl
+) else (
+    set TEST_ALL_FORMATS=wgsl,spvasm,msl,hlsl,glsl
+)
+call git bash -- ./test/tint/test-all.sh %BUILD_DIR%/tint.exe --verbose --format %TEST_ALL_FORMATS% || goto :error
 set PATH=%OLD_PATH%
 @echo off