Suppress flaky WebGPU CTS failure on Android

webgpu:api,validation,shader_module,entry_point:vertex:isAsync=true;shaderModuleStage="vertex"

Bug: chromium:338471695
Change-Id: I7d78cc2709fa1e954d4ad8f1882b4c47897aa0ea
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/186901
Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
diff --git a/webgpu-cts/expectations.txt b/webgpu-cts/expectations.txt
index 425efe0..e1a2dbe 100644
--- a/webgpu-cts/expectations.txt
+++ b/webgpu-cts/expectations.txt
@@ -286,6 +286,7 @@
 crbug.com/dawn/2331 [ dawn-backend-validation intel-0x9bc5 ubuntu ] webgpu:api,validation,render_pipeline,overrides:* [ RetryOnFailure ]
 crbug.com/dawn/2331 [ dawn-backend-validation intel-0x9bc5 ubuntu ] webgpu:api,validation,render_pipeline,primitive_state:strip_index_format:* [ RetryOnFailure ]
 crbug.com/dawn/2332 [ dawn-backend-validation intel-0x9bc5 ubuntu ] webgpu:api,operation,command_buffer,image_copy:origins_and_extents:initMethod="WriteTexture";checkMethod="FullCopyT2B";* [ RetryOnFailure ]
+crbug.com/338471695 [ android ] webgpu:api,validation,shader_module,entry_point:vertex:isAsync=true;shaderModuleStage="vertex" [ RetryOnFailure ]
 
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 # Miscellaneous flakes that are too flaky for retry