Support for absolute JS plugin urls

Change-Id: I777276aa187e90ffe33969dcecf14f87aa737f20

polygerrit-ui/app/elements/plugins/gr-plugin-host/gr-plugin-host.js

@@ -43,13 +43,20 @@
     },
 
     _loadJsPlugins(plugins) {
-      for (let i = 0; i < plugins.length; i++) {
-        const scriptEl = document.createElement('script');
-        scriptEl.defer = true;
-        scriptEl.src = '/' + plugins[i];
-        scriptEl.onerror = Gerrit._pluginInstalled;
-        document.body.appendChild(scriptEl);
+      for (let url of plugins) {
+        if (!url.startsWith('http')) {
+          url = '/' + url;
+        }
+        this._createScriptTag(url);
       }
     },
+
+    _createScriptTag(url) {
+      const el = document.createElement('script');
+      el.defer = true;
+      el.src = url;
+      el.onerror = Gerrit._pluginInstalled;
+      return document.body.appendChild(el);
+    },
   });
 })();

polygerrit-ui/app/elements/plugins/gr-plugin-host/gr-plugin-host_test.html

@@ -63,5 +63,14 @@ limitations under the License.
       assert.isTrue(element.importHref.calledWith(
           '/baz', Gerrit._pluginInstalled, Gerrit._pluginInstalled, true));
     });
+
+    test('imports js plugins from config', () => {
+      sandbox.stub(element, '_createScriptTag');
+      element.config = {
+        js_resource_paths: ['foo/bar', 'http://baz'],
+      };
+      assert.isTrue(element._createScriptTag.calledWith('/foo/bar'));
+      assert.isTrue(element._createScriptTag.calledWith('http://baz'));
+    });
   });
 </script>