Add android CTS exceptions

Change-Id: I193069371793115176a6d011bdddfd6e5a69c0a6
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/151040
Commit-Queue: Antonio Maiorano <amaiorano@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
diff --git a/webgpu-cts/expectations.txt b/webgpu-cts/expectations.txt
index ceb8832..6d98a6b 100644
--- a/webgpu-cts/expectations.txt
+++ b/webgpu-cts/expectations.txt
@@ -1627,3 +1627,5 @@
 crbug.com/tint/2030 webgpu:shader,validation,expression,call,builtin,log:values:stage="override";type="f32" [ RetryOnFailure ]
 crbug.com/1479533 [ win10 intel ] webgpu:api,operation,command_buffer,image_copy:origins_and_extents:initMethod="WriteTexture";checkMethod="PartialCopyT2B";format="bc6h-rgb-ufloat";dimension="2d" [ Failure ]
 crbug.com/dawn/0000 [ win10 intel ] worker_webgpu:api,validation,buffer,mapping:mapAsync,usage:* [ Failure ]
+crbug.com/dawn/0000 [ android ] webgpu:shader,validation,expression,call,builtin,atan2:values:stage="constant";type="vec4%3Cf32%3E" [ Failure ]
+crbug.com/dawn/0000 [ android ] webgpu:shader,validation,expression,call,builtin,sign:values:stage="constant";type="vec3%3Cabstract-float%3E" [ Failure ]