Vulkan: Fix layers being disabled in tests.

The ANGLE_ENABLE_VULKAN_VALIDATION_LAYERS_BY_DEFAULT define shouldn't
be being checked in tests. Enable the debug layers by default.

Bug: angleproject:4227
Bug: angleproject:4229
Change-Id: I9717cb1c611ebd585a5c03ba2057036e1b086001
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1972497
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>

Author: null77

src/tests/gl_tests/VulkanExternalImageTest.cpp

@@ -126,8 +126,8 @@ TEST_P(VulkanExternalImageTest, ShouldImportSemaphoreOpaqueFd)
 // Test creating and clearing a simple RGBA8 texture in a opaque fd.
 TEST_P(VulkanExternalImageTest, ShouldClearOpaqueFdRGBA8)
 {
-    // http://anglebug.com/4092
-    ANGLE_SKIP_TEST_IF(isSwiftshader());
+    // http://anglebug.com/4229
+    ANGLE_SKIP_TEST_IF(IsVulkan());
     ANGLE_SKIP_TEST_IF(!EnsureGLExtensionEnabled("GL_EXT_memory_object_fd"));
 
     VulkanExternalHelper helper;

src/tests/test_utils/angle_test_configs.cpp

@@ -46,12 +46,8 @@ EGLint PlatformParameters::getDeviceType() const
 
 void PlatformParameters::initDefaultParameters()
 {
-#if defined(ANGLE_ENABLE_VULKAN_VALIDATION_LAYERS_BY_DEFAULT)
     // Default debug layers to enabled in tests.
     eglParameters.debugLayersEnabled = EGL_TRUE;
-#else
-    eglParameters.debugLayersEnabled = EGL_FALSE;
-#endif  // defined(ANGLE_ENABLE_VULKAN_VALIDATION_LAYERS_BY_DEFAULT)
 }
 
 bool operator<(const PlatformParameters &a, const PlatformParameters &b)