Compat CTS: suppress readonly stencil failure.

Bug: dawn:2146

Change-Id: I4c11257617569a95003da7d65fcd557857aa26fb
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/158201
Commit-Queue: Stephen White <senorblanco@chromium.org>
Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
diff --git a/webgpu-cts/compat-expectations.txt b/webgpu-cts/compat-expectations.txt
index 3889b0e..945ede1 100644
--- a/webgpu-cts/compat-expectations.txt
+++ b/webgpu-cts/compat-expectations.txt
@@ -483,3 +483,5 @@
 [ angle-opengl intel ] webgpu:shader,execution,expression,call,builtin,ldexp:f32:inputSource="storage_r";* [ Failure ]
 [ angle-opengl intel ] webgpu:shader,execution,expression,call,builtin,ldexp:f32:inputSource="storage_rw";* [ Failure ]
 [ angle-opengl intel ] webgpu:shader,execution,expression,call,builtin,ldexp:f32:inputSource="uniform";* [ Failure ]
+
+crbug.com/dawn/2146 [ angle-opengl ] webgpu:api,validation,render_pass,render_pass_descriptor:depth_stencil_attachment,loadOp_storeOp_match_depthReadOnly_stencilReadOnly:format="depth24plus-stencil8" [ Failure ]