change Device.create_pipeline_cache to return an Arc<PipelineCache<A>

Author: teoxoy

wgpu-core/src/device/global.rs

@@ -1737,7 +1737,7 @@ impl Global {
             let cache = unsafe { device.create_pipeline_cache(desc) };
             match cache {
                 Ok(cache) => {
-                    let id = fid.assign(Arc::new(cache));
+                    let id = fid.assign(cache);
                     api_log!("Device::create_pipeline_cache -> {id:?}");
                     return (id, None);
                 }

wgpu-core/src/device/resource.rs

@@ -3397,7 +3397,7 @@ impl<A: HalApi> Device<A> {
     pub unsafe fn create_pipeline_cache(
         self: &Arc<Self>,
         desc: &pipeline::PipelineCacheDescriptor,
-    ) -> Result<pipeline::PipelineCache<A>, pipeline::CreatePipelineCacheError> {
+    ) -> Result<Arc<pipeline::PipelineCache<A>>, pipeline::CreatePipelineCacheError> {
         use crate::pipeline_cache;
 
         self.check_is_valid()?;
@@ -3436,6 +3436,9 @@ impl<A: HalApi> Device<A> {
             // This would be none in the error condition, which we don't implement yet
             raw: Some(raw),
         };
+
+        let cache = Arc::new(cache);
+
         Ok(cache)
     }