[Extensions Bindings] Request JS execution from messaging bindings

extensions/renderer/dispatcher.h

Index: extensions/renderer/dispatcher.h
diff --git a/extensions/renderer/dispatcher.h b/extensions/renderer/dispatcher.h
index 4ef3c00450f128b8e695272fd219d9f4db531841..ab83ff820db08d04654e7707d166e31a433373c5 100644
--- a/extensions/renderer/dispatcher.h
+++ b/extensions/renderer/dispatcher.h
@@ -142,6 +142,8 @@ class Dispatcher : public content::RenderThreadObserver,
                                      ExtensionBindingsSystem* bindings_system,
                                      V8SchemaRegistry* v8_schema_registry);
 
+  ExtensionBindingsSystem* bindings_system() { return bindings_system_.get(); }
+
  private:
   // The RendererPermissionsPolicyDelegateTest.CannotScriptWebstore test needs
   // to call the OnActivateExtension IPCs.