Port aria_util_test.js to run as a WebUI test.

chrome/renderer/chrome_render_view_observer.cc

Index: chrome/renderer/chrome_render_view_observer.cc
diff --git a/chrome/renderer/chrome_render_view_observer.cc b/chrome/renderer/chrome_render_view_observer.cc
index d292b3ed860523651df4c7c8840f13d1714af748..6bca11293b9b4ff5229ab9344c1c409cf4767630 100644
--- a/chrome/renderer/chrome_render_view_observer.cc
+++ b/chrome/renderer/chrome_render_view_observer.cc
@@ -256,7 +256,7 @@ bool ChromeRenderViewObserver::OnMessageReceived(const IPC::Message& message) {
 
 void ChromeRenderViewObserver::OnWebUIJavaScript(
     const base::string16& javascript) {
-  webui_javascript_ = javascript;
+  webui_javascript_.push_back(javascript);
 }
 
 #if defined(OS_ANDROID)
@@ -390,7 +390,10 @@ void ChromeRenderViewObserver::OnGetFPS() {
 void ChromeRenderViewObserver::DidStartLoading() {
   if ((render_view()->GetEnabledBindings() & content::BINDINGS_POLICY_WEB_UI) &&
       !webui_javascript_.empty()) {
-    render_view()->GetMainRenderFrame()->ExecuteJavaScript(webui_javascript_);
+    for (size_t i = 0; i < webui_javascript_.size(); ++i) {
+      render_view()->GetMainRenderFrame()->ExecuteJavaScript(
+          webui_javascript_[i]);
+    }
     webui_javascript_.clear();
   }
 }