WebGPU: Remove createBufferMappedAsync

Spec change:
  https://github.com/gpuweb/gpuweb/pull/516

Test change:
  https://github.com/gpuweb/cts/pull/100

Bug: 852089
Change-Id: I0ff5da9b131ba588ca7608b6966461ff67f5a0bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1975388
Commit-Queue: Jinho Bang <jinho.bang@samsung.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727370}

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

@@ -133,43 +133,6 @@ HeapVector<ScriptValue> GPUDevice::createBufferMapped(
   });
 }
 
-ScriptPromise GPUDevice::createBufferMappedAsync(
-    ScriptState* script_state,
-    const GPUBufferDescriptor* descriptor,
-    ExceptionState& exception_state) {
-  GPUBuffer* gpu_buffer;
-  DOMArrayBuffer* array_buffer;
-  std::tie(gpu_buffer, array_buffer) =
-      GPUBuffer::CreateMapped(this, descriptor, exception_state);
-
-  v8::Isolate* isolate = script_state->GetIsolate();
-  v8::Local<v8::Object> creation_context = script_state->GetContext()->Global();
-
-  v8::Local<v8::Value> elements[] = {
-      ToV8(gpu_buffer, creation_context, isolate),
-      ToV8(array_buffer, creation_context, isolate),
-  };
-
-  ScriptValue result(isolate, v8::Array::New(isolate, elements, 2));
-
-  auto* resolver = MakeGarbageCollected<ScriptPromiseResolver>(script_state);
-  ScriptPromise promise = resolver->Promise();
-  // TODO(enga): CreateBufferMappedAsync is intended to spend more time to
-  // create an optimal mapping for the buffer. It resolves the promise when the
-  // mapping is complete. Currently, there is always a staging buffer in the
-  // wire so this is already the optimal path and the promise is immediately
-  // resolved. When we can create a buffer such that the memory is mapped
-  // directly in the renderer process, this promise should be resolved
-  // asynchronously.
-
-  if (exception_state.HadException()) {
-    resolver->Reject(exception_state);
-  } else {
-    resolver->Resolve(result);
-  }
-  return promise;
-}
-
 GPUTexture* GPUDevice::createTexture(const GPUTextureDescriptor* descriptor,
                                      ExceptionState& exception_state) {
   return GPUTexture::Create(this, descriptor, exception_state);

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

@@ -72,9 +72,6 @@ class GPUDevice final : public EventTargetWithInlineData,
       ScriptState* script_state,
       const GPUBufferDescriptor* descriptor,
       ExceptionState& exception_state);
-  ScriptPromise createBufferMappedAsync(ScriptState* script_state,
-                                        const GPUBufferDescriptor* descriptor,
-                                        ExceptionState& exception_state);
   GPUTexture* createTexture(const GPUTextureDescriptor* descriptor,
                             ExceptionState& exception_state);
   GPUSampler* createSampler(const GPUSamplerDescriptor* descriptor);

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

@@ -14,7 +14,6 @@
 
     GPUBuffer createBuffer(GPUBufferDescriptor descriptor);
     [CallWith=ScriptState, RaisesException] GPUMappedBuffer createBufferMapped(GPUBufferDescriptor descriptor);
-    [CallWith=ScriptState, RaisesException] Promise<GPUMappedBuffer> createBufferMappedAsync(GPUBufferDescriptor descriptor);
     [RaisesException] GPUTexture createTexture(GPUTextureDescriptor descriptor);
     GPUSampler createSampler(optional GPUSamplerDescriptor descriptor = {});