Implement GPUQueue.submit in Blink

Bug: 877147
Change-Id: I29fa88ab691262974783a6e327d2b75fa1e70b60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1547937
Commit-Queue: Austin Eng <enga@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#648753}

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

@@ -5,6 +5,8 @@
 #include "third_party/blink/renderer/modules/webgpu/gpu_queue.h"
 
 #include "gpu/command_buffer/client/webgpu_interface.h"
+#include "third_party/blink/renderer/modules/webgpu/dawn_conversions.h"
+#include "third_party/blink/renderer/modules/webgpu/gpu_command_buffer.h"
 #include "third_party/blink/renderer/modules/webgpu/gpu_device.h"
 #include "third_party/blink/renderer/modules/webgpu/gpu_fence.h"
 #include "third_party/blink/renderer/modules/webgpu/gpu_fence_descriptor.h"
@@ -26,8 +28,20 @@ GPUQueue::~GPUQueue() {
   GetProcs().queueRelease(GetHandle());
 }
 
+void GPUQueue::submit(const HeapVector<Member<GPUCommandBuffer>>& buffers) {
+  std::unique_ptr<DawnCommandBuffer[]> commandBuffers = AsDawnType(buffers);
+
+  GetProcs().queueSubmit(GetHandle(), buffers.size(), commandBuffers.get());
+  // WebGPU guarantees that submitted commands finish in finite time so we
+  // flush commands to the GPU process now.
+  device_->GetInterface()->FlushCommands();
+}
+
 void GPUQueue::signal(GPUFence* fence, uint64_t signal_value) {
   GetProcs().queueSignal(GetHandle(), fence->GetHandle(), signal_value);
+  // Signaling a fence adds a callback to update the fence value to the
+  // completed value. WebGPU guarantees that the fence completion is
+  // observable in finite time so we flush commands to the GPU process now.
   device_->GetInterface()->FlushCommands();
 }
 

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

@@ -9,6 +9,7 @@
 
 namespace blink {
 
+class GPUCommandBuffer;
 class GPUFence;
 class GPUFenceDescriptor;
 
@@ -21,6 +22,7 @@ class GPUQueue : public DawnObject<DawnQueue> {
   ~GPUQueue() override;
 
   // gpu_queue.idl
+  void submit(const HeapVector<Member<GPUCommandBuffer>>& buffers);
   void signal(GPUFence* fence, uint64_t signal_value);
   GPUFence* createFence(const GPUFenceDescriptor* descriptor);
 

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

@@ -7,6 +7,7 @@
 [
     RuntimeEnabled=WebGPU
 ] interface GPUQueue {
+    void submit(sequence<GPUCommandBuffer> buffers);
     void signal(GPUFence fence, unsigned long long signalValue);
     GPUFence createFence(GPUFenceDescriptor descriptor);
 };