[WebGPU backend] Set explicit compute subgroup size configs in `APIGetInfo`

In WebGPU backend we did not populate the
`AdapterPropertiesExplicitComputeSubgroupSizeConfigs` struct in
`PhysicalDevice::PopulateBackendProperties()`, leaving
its fields at their default value of 0. When `APIGetInfo` checked the
post-condition `DAWN_ASSERT(IsPowerOfTwo(...))`, it failed because
`IsPowerOfTwo(0)` is false.

This patch fixes this assertion failure by supporting the query of
`AdapterPropertiesExplicitComputeSubgroupSizeConfigs` in `APIGetInfo`.

Bug: 413053623
Change-Id: Ibadf26ba117859a17b1a3655e5b5ca9070fcd259
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/297456
Commit-Queue: Shao, Jiawei <jiawei.shao@intel.com>
Reviewed-by: Shrek Shao <shrekshao@google.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>

src/dawn/native/webgpu/PhysicalDeviceWGPU.cpp

diff --git a/src/dawn/native/webgpu/PhysicalDeviceWGPU.cpp b/src/dawn/native/webgpu/PhysicalDeviceWGPU.cpp
index 476ffce..43bdacc 100644
--- a/src/dawn/native/webgpu/PhysicalDeviceWGPU.cpp
+++ b/src/dawn/native/webgpu/PhysicalDeviceWGPU.cpp
@@ -51,6 +51,17 @@
       mBackend(backend),
       mInnerAdapter(innerAdapter) {
     WGPUAdapterInfo info = {};
+
+    const bool supportsSubgroupSizeControl = GetFunctions().adapterHasFeature(
+        mInnerAdapter, WGPUFeatureName_ChromiumExperimentalSubgroupSizeControl);
+
+    WGPUAdapterPropertiesExplicitComputeSubgroupSizeConfigs explicitComputeSubgroupSizeConfigs = {};
+    explicitComputeSubgroupSizeConfigs.chain.sType =
+        WGPUSType_AdapterPropertiesExplicitComputeSubgroupSizeConfigs;
+    if (supportsSubgroupSizeControl) {
+        info.nextInChain = &explicitComputeSubgroupSizeConfigs.chain;
+    }
+
     WGPUStatus status = GetFunctions().adapterGetInfo(mInnerAdapter, &info);
     DAWN_ASSERT(status == WGPUStatus_Success);
     DAWN_ASSERT(info.backendType != WGPUBackendType_WebGPU);
@@ -67,6 +78,15 @@
     mSubgroupMaxSize = info.subgroupMaxSize;
     mInnerBackendType = info.backendType;
 
+    if (supportsSubgroupSizeControl) {
+        mMinExplicitComputeSubgroupSize =
+            explicitComputeSubgroupSizeConfigs.minExplicitComputeSubgroupSize;
+        mMaxExplicitComputeSubgroupSize =
+            explicitComputeSubgroupSizeConfigs.maxExplicitComputeSubgroupSize;
+        mMaxComputeWorkgroupSubgroups =
+            explicitComputeSubgroupSizeConfigs.maxComputeWorkgroupSubgroups;
+    }
+
     GetFunctions().adapterInfoFreeMembers(info);
 }
 
@@ -150,6 +170,14 @@
     if (auto* wgpuProperties = info.Get<AdapterPropertiesWGPU>()) {
         wgpuProperties->backendType = FromAPI(mInnerBackendType);
     }
+    if (auto* explicitSubgroupSizeConfigs =
+            info.Get<AdapterPropertiesExplicitComputeSubgroupSizeConfigs>()) {
+        explicitSubgroupSizeConfigs->minExplicitComputeSubgroupSize =
+            mMinExplicitComputeSubgroupSize;
+        explicitSubgroupSizeConfigs->maxExplicitComputeSubgroupSize =
+            mMaxExplicitComputeSubgroupSize;
+        explicitSubgroupSizeConfigs->maxComputeWorkgroupSubgroups = mMaxComputeWorkgroupSubgroups;
+    }
 }
 
 FeatureValidationResult PhysicalDevice::ValidateFeatureSupportedWithTogglesImpl(