Applescript: return value from execute javascript command

content/browser/renderer_host/render_view_host.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_view_host.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 467 matching lines @@
 
 int RenderViewHost::ExecuteJavascriptInWebFrameNotifyResult(
     const string16& frame_xpath,
     const string16& jscript) {
   static int next_id = 1;
   Send(new ViewMsg_ScriptEvalRequest(routing_id(), frame_xpath, jscript,
                                      next_id, true));
   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) {
   process()->set_ignore_input_events(false);
   bool is_waiting =
       is_waiting_for_beforeunload_ack_ || is_waiting_for_unload_ack_;
   if (is_waiting)
     StartHangMonitorTimeout(TimeDelta::FromMilliseconds(kUnloadTimeoutMS));
 
   ViewHostMsg_RunJavaScriptMessage::WriteReplyParams(reply_msg,
@@ skipping 962 matching lines @@
 
 void RenderViewHost::OnWebUISend(const GURL& source_url,
                                  const std::string& name,
                                  const base::ListValue& args) {
   delegate_->WebUISend(this, source_url, name, args);
 }
 
 void RenderViewHost::ClearPowerSaveBlockers() {
   STLDeleteValues(&power_save_blockers_);
 }