Add exportFileBinary to FlipperLib

Reviewed By: antonk52

Differential Revision: D39692937

fbshipit-source-id: 7b3c78d004a9734cd8ae660d5782be1f02c00009

desktop/scripts/jest-setup-after.tsx

@@ -170,6 +170,9 @@ function createStubRenderHost(): RenderHost {
     async exportFile() {
       return undefined;
     },
+    async exportFileBinary() {
+      return undefined;
+    },
     hasFocus() {
       return true;
     },