Bug 1924328 - feat(webgpu): recognize unimplemented dual-source-blending feature r=webgpu-reviewers,webidl,teoxoy,saschanaz

Differential Revision: https://phabricator.services.mozilla.com/D229829

dom/webgpu/Adapter.cpp

@@ -126,6 +126,10 @@ static Maybe<ffi::WGPUFeatures> ToWGPUFeatures(
 
     case dom::GPUFeatureName::Float32_filterable:
       return Some(WGPUFeatures_FLOAT32_FILTERABLE);
+
+    case dom::GPUFeatureName::Dual_source_blending:
+      // TODO: https://bugzilla.mozilla.org/show_bug.cgi?id=1924328
+      return Nothing();  // Some(WGPUFeatures_DUAL_SOURCE_BLENDING);
   }
   MOZ_CRASH("Bad GPUFeatureName.");
 }