Add instance feature for reusable adapters

webgpu.h

@@ -657,6 +657,13 @@ typedef enum WGPUInstanceFeatureName {
      * via @ref WGPUShaderSourceSPIRV.
      */
     WGPUInstanceFeatureName_ShaderSourceSPIRV = 0x00000002,
+    /**
+     * Normally, a @ref WGPUAdapter can only create a single device. If this is
+     * available and enabled, then adapters won't immediately expire when they
+     * create a device, so can be reused to make multiple devices. They may
+     * still expire for other reasons.
+     */
+    WGPUInstanceFeatureName_MultipleDevicesPerAdapter = 0x00000003,
     WGPUInstanceFeatureName_Force32 = 0x7FFFFFFF
 } WGPUInstanceFeatureName WGPU_ENUM_ATTRIBUTE;
 

webgpu.yml

@@ -541,6 +541,12 @@ enums:
         doc: |
           Enable passing SPIR-V shaders to @ref wgpuDeviceCreateShaderModule,
           via @ref WGPUShaderSourceSPIRV.
+      - name: multiple_devices_per_adapter
+        doc: |
+          Normally, a @ref WGPUAdapter can only create a single device. If this is
+          available and enabled, then adapters won't immediately expire when they
+          create a device, so can be reused to make multiple devices. They may
+          still expire for other reasons.
   - name: load_op
     doc: |
       TODO