JS side of Native Plugins

Summary:
Native plugins are plugins that can be written in mobile code alone (java/objc), provided they conform to a template, currently table is the only implemented template.

This adds support to flipper for handling them.

Reviewed By: danielbuechele

Differential Revision: D14502188

fbshipit-source-id: a96be9b06de1cecf7977c4ef2fd05b168f7f1330

src/chrome/PluginDebugger.js

@@ -171,7 +171,11 @@ class PluginDebugger extends Component<Props> {
     // bundled plugins are loaded from the defaultPlugins directory within
     // Flipper's package.
     const externalPluginPath = (p: PluginDefinition) =>
-      p.out.startsWith('./defaultPlugins/') ? null : p.entry;
+      p.out
+        ? p.out.startsWith('./defaultPlugins/')
+          ? null
+          : p.entry
+        : 'Native Plugin';
 
     this.props.gatekeepedPlugins.forEach(plugin =>
       rows.push(