Moar Compat CTS expectations cleanup / triage.

Change-Id: I759dac456754418bbf0936ac5affb4734040de4f
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/158208
Commit-Queue: Stephen White <senorblanco@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
diff --git a/webgpu-cts/compat-expectations.txt b/webgpu-cts/compat-expectations.txt
index 258e530..61de77b 100644
--- a/webgpu-cts/compat-expectations.txt
+++ b/webgpu-cts/compat-expectations.txt
@@ -82,6 +82,9 @@
 crbug.com/dawn/2006 [ angle-opengl ] webgpu:web_platform,copyToTexture,ImageData:* [ Failure ]
 crbug.com/dawn/2006 [ angle-opengl ] webgpu:web_platform,copyToTexture,ImageData:copy_subrect_from_ImageData:* [ Failure ]
 
+# Offscreen copy issue
+crbug.com/dawn/2137 [ angle-opengl ] webgpu:web_platform,copyToTexture,canvas:copy_contents_from_gpu_context_canvas:canvasType="offscreen";srcAndDstInSameGPUDevice=false;* [ Failure ]
+
 # snorm / stencil8 issues
 crbug.com/dawn/2080 [ angle-opengl ] webgpu:api,operation,resource_init,texture_zero:uninitialized_texture_is_zero:dimension="2d";readMethod="CopyToBuffer";format="stencil8" [ Failure ]
 crbug.com/dawn/2080 [ angle-opengl ] webgpu:api,operation,resource_init,texture_zero:uninitialized_texture_is_zero:dimension="2d";readMethod="CopyToTexture";format="stencil8" [ Failure ]
@@ -501,4 +504,5 @@
 [ 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 ]
 
+# Read-only separate depth and stencil is failing
 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 ]