Add "reveal" FS job and a wrapper

electron/index.js

@@ -336,6 +336,11 @@ ipcMain.handle("fs-job", async (event, job) => {
             return;
         }
 
+        case "reveal": {
+            shell.showItemInFolder(fname);
+            return;
+        }
+
         default:
             throw new Error("Unknown fs job: " + job.type);
     }

electron_gog/index.js

@@ -335,6 +335,11 @@ ipcMain.handle("fs-job", async (event, job) => {
             return;
         }
 
+        case "reveal": {
+            shell.showItemInFolder(fname);
+            return;
+        }
+
         default:
             throw new Error("Unknown fs job: " + job.type);
     }

src/js/platform/electron/storage.js

@@ -38,4 +38,11 @@ export class StorageImplElectron extends StorageInterface {
             filename,
         });
     }
+
+    revealFileAsync(filename) {
+        return ipcRenderer.invoke("fs-job", {
+            type: "reveal",
+            filename,
+        });
+    }
 }