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diff --git a/dom/webgpu/ipc/PWebGPU.ipdl b/dom/webgpu/ipc/PWebGPU.ipdl
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+++ b/dom/webgpu/ipc/PWebGPU.ipdl
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=8 et :
+ */
+/* 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 http://mozilla.org/MPL/2.0/. */
+
+using mozilla::layers::RGBDescriptor from "mozilla/layers/LayersSurfaces.h";
+using mozilla::layers::RemoteTextureId from "mozilla/layers/LayersTypes.h";
+using mozilla::layers::RemoteTextureOwnerId from "mozilla/layers/LayersTypes.h";
+using mozilla::webgpu::RawId from "mozilla/webgpu/WebGPUTypes.h";
+using mozilla::dom::GPURequestAdapterOptions from "mozilla/dom/WebGPUBinding.h";
+using mozilla::dom::GPUCommandBufferDescriptor from "mozilla/dom/WebGPUBinding.h";
+using mozilla::dom::GPUBufferDescriptor from "mozilla/dom/WebGPUBinding.h";
+using mozilla::webgpu::MaybeScopedError from "mozilla/webgpu/WebGPUTypes.h";
+using mozilla::webgpu::WebGPUCompilationMessage from "mozilla/webgpu/WebGPUTypes.h";
+[MoveOnly] using class mozilla::ipc::UnsafeSharedMemoryHandle from "mozilla/ipc/RawShmem.h";
+
+include "mozilla/ipc/ByteBufUtils.h";
+include "mozilla/layers/LayersMessageUtils.h";
+include "mozilla/webgpu/WebGPUSerialize.h";
+include "mozilla/layers/WebRenderMessageUtils.h";
+include protocol PCanvasManager;
+include PWebGPUTypes;
+
+namespace mozilla {
+namespace webgpu {
+
+/**
+ * Represents the connection between a WebGPUChild actor that issues WebGPU
+ * command from the content process, and a WebGPUParent in the compositor
+ * process that runs the commands.
+ */
+async protocol PWebGPU
+{
+  manager PCanvasManager;
+
+parent:
+  async DeviceAction(RawId selfId, ByteBuf buf);
+  async DeviceActionWithAck(RawId selfId, ByteBuf buf) returns (bool dummy);
+  async TextureAction(RawId selfId, RawId aDeviceId, ByteBuf buf);
+  async CommandEncoderAction(RawId selfId, RawId aDeviceId, ByteBuf buf);
+  async BumpImplicitBindGroupLayout(RawId pipelineId, bool isCompute, uint32_t index, RawId assignId);
+
+  async CreateBuffer(RawId deviceId, RawId bufferId, GPUBufferDescriptor desc, UnsafeSharedMemoryHandle shm);
+
+  async InstanceRequestAdapter(GPURequestAdapterOptions options, RawId[] ids) returns (ByteBuf byteBuf);
+  async AdapterRequestDevice(RawId selfId, ByteBuf buf, RawId newId) returns (bool success);
+  async AdapterDestroy(RawId selfId);
+  // TODO: We want to return an array of compilation messages.
+  async DeviceCreateShaderModule(RawId selfId, RawId bufferId, nsString label, nsCString code) returns (WebGPUCompilationMessage[] messages);
+  async BufferMap(RawId selfId, uint32_t aMode, uint64_t offset, uint64_t size) returns (BufferMapResult result);
+  async BufferUnmap(RawId deviceId, RawId bufferId, bool flush);
+  async BufferDestroy(RawId selfId);
+  async BufferDrop(RawId selfId);
+  async TextureDestroy(RawId selfId);
+  async TextureViewDestroy(RawId selfId);
+  async SamplerDestroy(RawId selfId);
+  async DeviceDestroy(RawId selfId);
+
+  async CommandEncoderFinish(RawId selfId, RawId deviceId, GPUCommandBufferDescriptor desc);
+  async CommandEncoderDestroy(RawId selfId);
+  async CommandBufferDestroy(RawId selfId);
+  async RenderBundleDestroy(RawId selfId);
+  async QueueSubmit(RawId selfId, RawId aDeviceId, RawId[] commandBuffers);
+  async QueueWriteAction(RawId selfId, RawId aDeviceId, ByteBuf buf, UnsafeSharedMemoryHandle shmem);
+
+  async BindGroupLayoutDestroy(RawId selfId);
+  async PipelineLayoutDestroy(RawId selfId);
+  async BindGroupDestroy(RawId selfId);
+  async ShaderModuleDestroy(RawId selfId);
+  async ComputePipelineDestroy(RawId selfId);
+  async RenderPipelineDestroy(RawId selfId);
+  async ImplicitLayoutDestroy(RawId implicitPlId, RawId[] implicitBglIds);
+  async DeviceCreateSwapChain(RawId selfId, RawId queueId, RGBDescriptor desc, RawId[] bufferIds, RemoteTextureOwnerId ownerId);
+  async SwapChainPresent(RawId textureId, RawId commandEncoderId, RemoteTextureId remoteTextureId, RemoteTextureOwnerId remoteTextureOwnerId);
+  async SwapChainDestroy(RemoteTextureOwnerId ownerId);
+
+  async DevicePushErrorScope(RawId selfId);
+  async DevicePopErrorScope(RawId selfId) returns (MaybeScopedError maybeError);
+
+  // Generate an error on the Device timeline for `deviceId`.
+  // The `message` parameter is interpreted as UTF-8.
+  async GenerateError(RawId deviceId, nsCString message);
+
+child:
+  async DeviceUncapturedError(RawId aDeviceId, nsCString message);
+  async DropAction(ByteBuf buf);
+  async __delete__();
+};
+
+} // webgpu
+} // mozilla