Kokoro: Add ReactorUnitTests to windows presubmits

This appears to be accidentally missing.

Bug: b/145836207
Change-Id: Iaeb71c362f3b8450f91355e8d1f16c8d58c56548
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/39108
Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
diff --git a/tests/kokoro/gcp_windows/continuous.bat b/tests/kokoro/gcp_windows/continuous.bat
index f874e23..aa3b925 100644
--- a/tests/kokoro/gcp_windows/continuous.bat
+++ b/tests/kokoro/gcp_windows/continuous.bat
@@ -28,6 +28,9 @@
 if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
 SET SWIFTSHADER_DISABLE_DEBUGGER_WAIT_DIALOG=1
 
+build\Debug\ReactorUnitTests.exe
+if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
+
 build\Debug\gles-unittests.exe
 if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!