Request selected layout styles before common CSS blocks the bootstrap

frontend/shell-consistency.test.js

@@ -75,6 +75,7 @@ test('only core scripts and styles remain eager; native fallback and active layo
   }
   assert.ok(html.indexOf('id="ytp-assets"')<html.indexOf('src="lazy.js"'));
   assert.ok(html.indexOf('src="lazy.js"')<html.indexOf('</head>'));
+  assert.ok(html.indexOf('src="lazy.js"')<html.indexOf('rel="stylesheet"'),'head bootstrap must not wait for common CSS before requesting the selected layout');
   assert.deepEqual(JSON.parse(html.match(/id="ytp-assets">([^<]+)<\/script>/)[1]).groups,groups);
   for(const name of ['playlist','settings','service-mode','lyrics-editor'])assert.ok(groups['feature:'+name].eager);
 });