Fix examples linking error when building with CMake

ScopedAutoreleasePool.cpp was not added to dawn_utils library sources,
which caused unresolved externals while linking examples.

Change-Id: Ia9de3135b814663cce33b719dbbb22971b8b9d43
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/56282
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
diff --git a/src/utils/CMakeLists.txt b/src/utils/CMakeLists.txt
index 13b858c..91ad7c3 100644
--- a/src/utils/CMakeLists.txt
+++ b/src/utils/CMakeLists.txt
@@ -19,6 +19,8 @@
     "ComboRenderPipelineDescriptor.cpp"
     "ComboRenderPipelineDescriptor.h"
     "PlatformDebugLogger.h"
+    "ScopedAutoreleasePool.cpp"
+    "ScopedAutoreleasePool.h"
     "SystemUtils.cpp"
     "SystemUtils.h"
     "TerribleCommandBuffer.cpp"