Implement zero-sized QuerySet

- Add zero-sized implementation in each backend.
- Test creating zero-sized query set for each type.

Bug: dawn:954
Change-Id: Ib2b8a7d890dae6ee40f5a05aac570a4600dedab8
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/56260
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jiawei Shao <jiawei.shao@intel.com>
Commit-Queue: Hao Li <hao.x.li@intel.com>

src/dawn_native/d3d12/QuerySetD3D12.cpp

@@ -43,7 +43,7 @@ namespace dawn_native { namespace d3d12 {
     MaybeError QuerySet::Initialize() {
         D3D12_QUERY_HEAP_DESC queryHeapDesc = {};
         queryHeapDesc.Type = D3D12QueryHeapType(GetQueryType());
-        queryHeapDesc.Count = GetQueryCount();
+        queryHeapDesc.Count = std::max(GetQueryCount(), uint32_t(1u));
 
         ID3D12Device* d3d12Device = ToBackend(GetDevice())->GetD3D12Device();
         return CheckOutOfMemoryHRESULT(

src/dawn_native/metal/QuerySetMTL.mm

@@ -42,7 +42,7 @@ namespace dawn_native { namespace metal {
             }
             ASSERT(descriptor.counterSet != nullptr);
 
-            descriptor.sampleCount = count;
+            descriptor.sampleCount = static_cast<NSUInteger>(std::max(count, uint32_t(1u)));
             descriptor.storageMode = MTLStorageModePrivate;
             if (device->IsToggleEnabled(Toggle::MetalUseSharedModeForCounterSampleBuffer)) {
                 descriptor.storageMode = MTLStorageModeShared;
@@ -75,7 +75,8 @@ namespace dawn_native { namespace metal {
         switch (GetQueryType()) {
             case wgpu::QueryType::Occlusion: {
                 // Create buffer for writing 64-bit results.
-                NSUInteger bufferSize = static_cast<NSUInteger>(GetQueryCount() * sizeof(uint64_t));
+                NSUInteger bufferSize = static_cast<NSUInteger>(
+                    std::max(GetQueryCount() * sizeof(uint64_t), size_t(4u)));
                 mVisibilityBuffer = AcquireNSPRef([device->GetMTLDevice()
                     newBufferWithLength:bufferSize
                                 options:MTLResourceStorageModePrivate]);

src/dawn_native/vulkan/QuerySetVk.cpp

@@ -77,7 +77,7 @@ namespace dawn_native { namespace vulkan {
         createInfo.pNext = NULL;
         createInfo.flags = 0;
         createInfo.queryType = VulkanQueryType(GetQueryType());
-        createInfo.queryCount = GetQueryCount();
+        createInfo.queryCount = std::max(GetQueryCount(), uint32_t(1u));
         if (GetQueryType() == wgpu::QueryType::PipelineStatistics) {
             createInfo.pipelineStatistics =
                 VulkanQueryPipelineStatisticFlags(GetPipelineStatistics());