[core] Implement WebGPUError for WaitIdleError.

Author: jimblandy

wgpu-core/src/device/life.rs

@@ -2,6 +2,7 @@ use alloc::{sync::Arc, vec::Vec};
 
 use smallvec::SmallVec;
 use thiserror::Error;
+use wgt::error::{ErrorType, WebGpuError};
 
 use crate::{
     device::{
@@ -146,6 +147,17 @@ impl WaitIdleError {
     }
 }
 
+impl WebGpuError for WaitIdleError {
+    fn webgpu_error_type(&self) -> ErrorType {
+        match self {
+            WaitIdleError::Device(device_error) => device_error.webgpu_error_type(),
+            WaitIdleError::WrongSubmissionIndex(_, _) | WaitIdleError::Timeout => {
+                ErrorType::Internal
+            }
+        }
+    }
+}
+
 /// Resource tracking for a device.
 ///
 /// ## Host mapping buffers