Applescript: return value from execute javascript command

content/browser/renderer_host/render_view_host.cc

Index: content/browser/renderer_host/render_view_host.cc
diff --git a/content/browser/renderer_host/render_view_host.cc b/content/browser/renderer_host/render_view_host.cc
index 8135f5e0d18f8d93cb6584d53d8c9e098bf48088..c3b45f0f8e194951c14c081ee6d206a67fd74ad8 100644
--- a/content/browser/renderer_host/render_view_host.cc
+++ b/content/browser/renderer_host/render_view_host.cc
@@ -485,6 +485,42 @@ int RenderViewHost::ExecuteJavascriptInWebFrameNotifyResult(
   return next_id++;
 }
 
+typedef std::pair<int, Value*> ExecuteDetailType;
+
+ExecuteNotificationObserver::ExecuteNotificationObserver(int id)
+: id_(id) {
+}
+
+ExecuteNotificationObserver::~ExecuteNotificationObserver() {
+}
+
+void ExecuteNotificationObserver::Observe(int type,
+                     const content::NotificationSource& source,
+                     const content::NotificationDetails& details) {
+  content::Details<ExecuteDetailType> execute_details =
+      static_cast<content::Details<ExecuteDetailType> >(details);
+  int id = execute_details->first;
+  if (id != id_)
+    return;
+  Value* value = execute_details->second;
+  if (value)
+    value_.reset(value->DeepCopy());
+  MessageLoop::current()->Quit();
+}
+
+Value* RenderViewHost::ExecuteJavascriptAndGetValue(const string16& frame_xpath,
+                                                    const string16& jscript) {
+  int id = ExecuteJavascriptInWebFrameNotifyResult(frame_xpath, jscript);
+  ExecuteNotificationObserver observer(id);
+  content::NotificationRegistrar notification_registrar;
+  notification_registrar.Add(
+      &observer, content::NOTIFICATION_EXECUTE_JAVASCRIPT_RESULT,
+      content::Source<RenderViewHost>(this));
+  MessageLoop* loop = MessageLoop::current();
+  loop->Run();
+  return observer.value()->DeepCopy();
+}
+
 void RenderViewHost::JavaScriptDialogClosed(IPC::Message* reply_msg,
                                             bool success,
                                             const string16& user_input) {