add ISkiaGpuWithPlatformGraphicsContext interface to vulkan skia gpu (#17895)

Author: emmauss

src/Skia/Avalonia.Skia/Gpu/Vulkan/VulkanSkiaGpu.cs

@@ -7,7 +7,7 @@
 
 namespace Avalonia.Skia.Vulkan;
 
-internal class VulkanSkiaGpu : ISkiaGpu
+internal class VulkanSkiaGpu : ISkiaGpuWithPlatformGraphicsContext
 {
     private readonly VulkanSkiaExternalObjectsFeature? _externalObjects;
     public IVulkanPlatformGraphicsContext Vulkan { get; private set; }
@@ -72,6 +72,9 @@ public void Dispose()
     }
 
     public bool IsLost => Vulkan.IsLost;
+
+    public IPlatformGraphicsContext? PlatformGraphicsContext => Vulkan;
+
     public IDisposable EnsureCurrent() => Vulkan.EnsureCurrent();
 
 
@@ -83,4 +86,7 @@ public ISkiaGpuRenderTarget TryCreateRenderTarget(IEnumerable<object> surfaces)
 
 
     public ISkiaSurface? TryCreateSurface(PixelSize size, ISkiaGpuRenderSession? session) => null;
-}
+
+    public IScopedResource<GRContext> TryGetGrContext() =>
+        ScopedResource<GRContext>.Create(GrContext, EnsureCurrent().Dispose);
+}