Auto merge of #25029 - szeged:wgpu_request_device, r=jdm

Initial implementation of GPUDevice for WebGPU

Added the WebIDL bindigs for GPUDevice, GPUObjectDescriptorBase, GPUDeviceDescriptor, GPUObjectBase
Implemented the `requestDevice` function of `GPUAdapter`

<!-- Please describe your changes on the following line: -->

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X]  These changes addresses a part of #24706

cc @jdm, @kvark, @zakorgy

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

components/script/dom/webidls/GPUAdapter.webidl

@@ -10,5 +10,25 @@ interface GPUAdapter {
     //readonly attribute GPULimits limits; Don’t expose higher limits for now.
 
     // May reject with DOMException  // TODO: DOMException("OperationError")?
-    // Promise<GPUDevice> requestDevice(optional GPUDeviceDescriptor descriptor = {});
+    Promise<GPUDevice> requestDevice(optional GPUDeviceDescriptor descriptor = {});
+};
+
+dictionary GPUDeviceDescriptor : GPUObjectDescriptorBase {
+    GPUExtensions extensions = {};
+    GPULimits limits = {};
+};
+
+dictionary GPUExtensions {
+    boolean anisotropicFiltering = false;
+};
+
+dictionary GPULimits {
+    unsigned long maxBindGroups = 4;
+    unsigned long maxDynamicUniformBuffersPerPipelineLayout = 8;
+    unsigned long maxDynamicStorageBuffersPerPipelineLayout = 4;
+    unsigned long maxSampledTexturesPerShaderStage = 16;
+    unsigned long maxSamplersPerShaderStage = 16;
+    unsigned long maxStorageBuffersPerShaderStage = 4;
+    unsigned long maxStorageTexturesPerShaderStage = 4;
+    unsigned long maxUniformBuffersPerShaderStage = 12;
 };

components/script/dom/webidls/GPUDevice.webidl

@@ -0,0 +1,31 @@
+/* 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/. */
+
+// https://gpuweb.github.io/gpuweb/#gpudevice
+[Exposed=(Window, DedicatedWorker)/*, Serializable */, Pref="dom.webgpu.enabled"]
+interface GPUDevice : EventTarget {
+    readonly attribute GPUAdapter adapter;
+    readonly attribute object extensions;
+    readonly attribute object limits;
+
+    /*GPUBuffer createBuffer(GPUBufferDescriptor descriptor);
+    GPUMappedBuffer createBufferMapped(GPUBufferDescriptor descriptor);
+    Promise<GPUMappedBuffer> createBufferMappedAsync(GPUBufferDescriptor descriptor);
+    GPUTexture createTexture(GPUTextureDescriptor descriptor);
+    GPUSampler createSampler(optional GPUSamplerDescriptor descriptor = {});
+
+    GPUBindGroupLayout createBindGroupLayout(GPUBindGroupLayoutDescriptor descriptor);
+    GPUPipelineLayout createPipelineLayout(GPUPipelineLayoutDescriptor descriptor);
+    GPUBindGroup createBindGroup(GPUBindGroupDescriptor descriptor);
+
+    GPUShaderModule createShaderModule(GPUShaderModuleDescriptor descriptor);
+    GPUComputePipeline createComputePipeline(GPUComputePipelineDescriptor descriptor);
+    GPURenderPipeline createRenderPipeline(GPURenderPipelineDescriptor descriptor);
+
+    GPUCommandEncoder createCommandEncoder(optional GPUCommandEncoderDescriptor descriptor = {});
+    GPURenderBundleEncoder createRenderBundleEncoder(GPURenderBundleEncoderDescriptor descriptor);
+
+    GPUQueue getQueue();*/
+};
+GPUDevice includes GPUObjectBase;

components/script/dom/webidls/GPUObjectBase.webidl

@@ -0,0 +1,13 @@
+/* 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/. */
+
+// https://gpuweb.github.io/gpuweb/#gpuobjectbase
+[Exposed=(Window)]
+interface mixin GPUObjectBase {
+    attribute DOMString? label;
+};
+
+dictionary GPUObjectDescriptorBase {
+    DOMString? label;
+};