webgpu: Implement proper async pipeline creation and GPUPipelineError (#32636)

* Add GPUPipelineError

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

* Proper GetBindGroupLayout

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

* Proper Create*PipelineAsync

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

* Expectations

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

* fixups

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

* more good expectations

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

---------

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

components/script/dom/gpupipelineerror.rs

@@ -0,0 +1,70 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use dom_struct::dom_struct;
+use js::rust::HandleObject;
+
+use super::bindings::codegen::Bindings::WebGPUBinding::{
+    GPUPipelineErrorInit, GPUPipelineErrorMethods, GPUPipelineErrorReason,
+};
+use crate::dom::bindings::reflector::reflect_dom_object_with_proto;
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::bindings::str::DOMString;
+use crate::dom::domexception::DOMException;
+use crate::dom::globalscope::GlobalScope;
+
+/// <https://gpuweb.github.io/gpuweb/#gpupipelineerror>
+#[dom_struct]
+pub struct GPUPipelineError {
+    exception: DOMException,
+    reason: GPUPipelineErrorReason,
+}
+
+impl GPUPipelineError {
+    fn new_inherited(message: DOMString, reason: GPUPipelineErrorReason) -> Self {
+        Self {
+            exception: DOMException::new_inherited(message, "GPUPipelineError".into()),
+            reason,
+        }
+    }
+
+    pub fn new_with_proto(
+        global: &GlobalScope,
+        proto: Option<HandleObject>,
+        message: DOMString,
+        reason: GPUPipelineErrorReason,
+    ) -> DomRoot<Self> {
+        reflect_dom_object_with_proto(
+            Box::new(Self::new_inherited(message, reason)),
+            global,
+            proto,
+        )
+    }
+
+    pub fn new(
+        global: &GlobalScope,
+        message: DOMString,
+        reason: GPUPipelineErrorReason,
+    ) -> DomRoot<Self> {
+        Self::new_with_proto(global, None, message, reason)
+    }
+
+    /// <https://gpuweb.github.io/gpuweb/#dom-gpupipelineerror-constructor>
+    #[allow(non_snake_case)]
+    pub fn Constructor(
+        global: &GlobalScope,
+        proto: Option<HandleObject>,
+        message: DOMString,
+        options: &GPUPipelineErrorInit,
+    ) -> DomRoot<Self> {
+        Self::new_with_proto(global, proto, message, options.reason)
+    }
+}
+
+impl GPUPipelineErrorMethods for GPUPipelineError {
+    /// <https://gpuweb.github.io/gpuweb/#dom-gpupipelineerror-reason>
+    fn Reason(&self) -> GPUPipelineErrorReason {
+        self.reason
+    }
+}