WebGPU: Add [SameObject] to several more attributes

Spec change:
  https://github.com/gpuweb/gpuweb/pull/496

Bug: 852089
Change-Id: I0b786ebaf3cb4084ecf755c9175c2fe51d9eca22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1936693
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719540}

third_party/blink/renderer/modules/webgpu/gpu_device.idl

@@ -7,7 +7,7 @@
 [
     Exposed(Window WebGPU, Worker WebGPU)
 ] interface GPUDevice : EventTarget {
-    readonly attribute GPUAdapter adapter;
+    [SameObject] readonly attribute GPUAdapter adapter;
     [CallWith=ScriptState] readonly attribute Promise<GPUDeviceLostInfo> lost;
 
     [SameObject] readonly attribute GPUQueue defaultQueue;

third_party/blink/renderer/modules/webgpu/gpu_uncaptured_error_event.idl

@@ -8,5 +8,5 @@
     Constructor(DOMString type, GPUUncapturedErrorEventInit gpuUncapturedErrorEventInitDict),
     Exposed(Window WebGPU, Worker WebGPU)
 ] interface GPUUncapturedErrorEvent : Event {
-    readonly attribute GPUError error;
+    [SameObject] readonly attribute GPUError error;
 };