Hook up test runner to new layout_test_html_viewer

components/html_viewer/html_viewer.h

Index: components/html_viewer/html_viewer.h
diff --git a/components/html_viewer/html_viewer.h b/components/html_viewer/html_viewer.h
index 1a7fd9a6a36ff68b8ac9dc0dcdf2c76bf91d2ed9..ba8af6a11b845c877001cf6fb03e50ab67bddcee 100644
--- a/components/html_viewer/html_viewer.h
+++ b/components/html_viewer/html_viewer.h
@@ -21,9 +21,15 @@ class HTMLViewer : public mojo::ApplicationDelegate,
   HTMLViewer();
   ~HTMLViewer() override;
 
- private:
+ protected:
+  GlobalState* global_state() const { return global_state_.get(); }
+  mojo::ApplicationImpl* app() const { return app_; }
+
   // Overridden from ApplicationDelegate:
   void Initialize(mojo::ApplicationImpl* app) override;
+
+ private:
+  // Overridden from ApplicationDelegate:
   bool ConfigureIncomingConnection(
       mojo::ApplicationConnection* connection) override;