Bug 1754302 - WebGPU should consistently use GetCurrentSerialEventTarget instead of GetMainThreadSerialEventTarget. r=kvark

This is necessary for when WebGPU objects are accessed from a worker
thread instead of the main thread. It should be otherwise a
non-functional change.

Differential Revision: https://phabricator.services.mozilla.com/D138206

dom/webgpu/Buffer.cpp

@@ -114,7 +114,7 @@ already_AddRefed<dom::Promise> Buffer::MapAsync(
   }
 
   mappingPromise->Then(
-      GetMainThreadSerialEventTarget(), __func__,
+      GetCurrentSerialEventTarget(), __func__,
       [promise, self](ipc::Shmem&& aShmem) {
         self->mMapped->mShmem = std::move(aShmem);
         promise->MaybeResolve(0);

dom/webgpu/Device.cpp

@@ -247,7 +247,7 @@ already_AddRefed<dom::Promise> Device::CreateComputePipelineAsync(
   context->mParentId = mId;
   mBridge->DeviceCreateComputePipelineAsync(context.get(), aDesc)
       ->Then(
-          GetMainThreadSerialEventTarget(), __func__,
+          GetCurrentSerialEventTarget(), __func__,
           [self = RefPtr{this}, context, promise](RawId aId) {
             RefPtr<ComputePipeline> object = new ComputePipeline(
                 self, aId, context->mImplicitPipelineLayoutId,
@@ -274,7 +274,7 @@ already_AddRefed<dom::Promise> Device::CreateRenderPipelineAsync(
   context->mParentId = mId;
   mBridge->DeviceCreateRenderPipelineAsync(context.get(), aDesc)
       ->Then(
-          GetMainThreadSerialEventTarget(), __func__,
+          GetCurrentSerialEventTarget(), __func__,
           [self = RefPtr{this}, context, promise](RawId aId) {
             RefPtr<RenderPipeline> object = new RenderPipeline(
                 self, aId, context->mImplicitPipelineLayoutId,
@@ -351,7 +351,7 @@ already_AddRefed<dom::Promise> Device::PopErrorScope(ErrorResult& aRv) {
   auto errorPromise = mBridge->SendDevicePopErrorScope(mId);
 
   errorPromise->Then(
-      GetMainThreadSerialEventTarget(), __func__,
+      GetCurrentSerialEventTarget(), __func__,
       [self = RefPtr{this}, promise](const MaybeScopedError& aMaybeError) {
         if (aMaybeError) {
           if (aMaybeError->operationError) {

dom/webgpu/Instance.cpp

@@ -60,7 +60,7 @@ already_AddRefed<dom::Promise> Instance::RequestAdapter(
   RefPtr<Instance> instance = this;
 
   mBridge->InstanceRequestAdapter(aOptions)->Then(
-      GetMainThreadSerialEventTarget(), __func__,
+      GetCurrentSerialEventTarget(), __func__,
       [promise, instance](ipc::ByteBuf aInfoBuf) {
         ffi::WGPUAdapterInformation info = {};
         ffi::wgpu_client_adapter_extract_info(ToFFI(&aInfoBuf), &info);