Make Windows Kokoro script less verbose

tests/kokoro/gcp_windows/continuous.bat

@@ -3,11 +3,9 @@
 SETLOCAL ENABLEDELAYEDEXPANSION
 
 SET PATH=C:\python36;C:\Program Files\cmake\bin;%PATH%
-set SRC=%cd%\git\SwiftShader
-
-cd %SRC%
-if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
+SET SRC=%cd%\git\SwiftShader
 
+cd %SRC% || goto :error
 
 IF "%LLVM_VERSION%"=="10.0" (
   ECHO "TODO(b/152339534): LLVM 10 migration is still in progress"
@@ -17,10 +15,9 @@ IF "%LLVM_VERSION%"=="10.0" (
 # Lower the amount of debug info, to reduce Kokoro build times.
 SET LESS_DEBUG_INFO=1
 
-cd %SRC%\build
-if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
+cd %SRC%\build || goto :error
 
-rem Update CMake
+REM Update CMake
 choco upgrade cmake -y --limit-output --no-progress
 cmake --version
 
@@ -31,42 +28,27 @@ cmake .. ^
     "-DREACTOR_BACKEND=%REACTOR_BACKEND%" ^
     "-DSWIFTSHADER_LLVM_VERSION=%LLVM_VERSION%" ^
     "-DREACTOR_VERIFY_LLVM_IR=1" ^
-    "-DLESS_DEBUG_INFO=%LESS_DEBUG_INFO%"
-if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
+    "-DLESS_DEBUG_INFO=%LESS_DEBUG_INFO%" || goto :error
 
-cmake --build .
-if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
+cmake --build . || goto :error
 
 REM Run the unit tests. Some must be run from project root
-cd %SRC%
-if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
+cd %SRC% || goto :error
 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!
-
-build\Debug\system-unittests.exe
-if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
-
-build\Debug\vk-unittests.exe
-if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
+build\Debug\ReactorUnitTests.exe || goto :error
+build\Debug\gles-unittests.exe || goto :error
+build\Debug\system-unittests.exe || goto :error
+build\Debug\vk-unittests.exe || goto :error
 
-Rem Incrementally build and run rr::Print unit tests
-cd %SRC%\build
-if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
+REM Incrementally build and run rr::Print unit tests
+cd %SRC%\build || goto :error
+cmake "-DREACTOR_ENABLE_PRINT=1" .. || goto :error
+cmake --build . --target ReactorUnitTests || goto :error
+cd %SRC% || goto :error
+build\Debug\ReactorUnitTests.exe --gtest_filter=ReactorUnitTests.Print* || goto :error
 
-cmake "-DREACTOR_ENABLE_PRINT=1" ..
-if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
-
-cmake --build . --target ReactorUnitTests
-if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
-
-cd %SRC%
-if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
-SET SWIFTSHADER_DISABLE_DEBUGGER_WAIT_DIALOG=1
+exit /b 0
 
-build\Debug\ReactorUnitTests.exe --gtest_filter=ReactorUnitTests.Print*
-if !ERRORLEVEL! neq 0 exit /b !ERRORLEVEL!
+:error
+exit /b !ERRORLEVEL!