Refactor extension event distribution to use Values instead of JSON strings.

chrome/browser/extensions/extension_messages_apitest.cc

 // Copyright (c) 2012 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 "base/values.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_event_router.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_service.h"
 #include "googleurl/src/gurl.h"
 
 namespace {
 
 class MessageSender : public content::NotificationObserver {
  public:
   MessageSender() {
     registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_HOST_DID_STOP_LOADING,
                    content::NotificationService::AllSources());
   }
 
  private:
+  static ListValue* BuildEventArguments(const bool last_message,
+                                 const std::string& data) {
+    DictionaryValue* event = new DictionaryValue();
+    event->SetBoolean("lastMessage", last_message);
+    event->SetString("data", data);
+    ListValue* arguments = new ListValue();
+    arguments->Append(event);
+    return arguments;
+  }
+
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) {
     ExtensionEventRouter* event_router =
         content::Source<Profile>(source).ptr()->GetExtensionEventRouter();
 
     // Sends four messages to the extension. All but the third message sent
     // from the origin http://b.com/ are supposed to arrive.
     event_router->DispatchEventToRenderers("test.onMessage",
-        "[{\"lastMessage\":false,\"data\":\"no restriction\"}]",
+        BuildEventArguments(false, "no restriction"),
         content::Source<Profile>(source).ptr(),
         GURL());
     event_router->DispatchEventToRenderers("test.onMessage",
-        "[{\"lastMessage\":false,\"data\":\"http://a.com/\"}]",
+        BuildEventArguments(false, "http://a.com/"),
         content::Source<Profile>(source).ptr(),
         GURL("http://a.com/"));
     event_router->DispatchEventToRenderers("test.onMessage",
-        "[{\"lastMessage\":false,\"data\":\"http://b.com/\"}]",
+        BuildEventArguments(false, "http://b.com/"),
         content::Source<Profile>(source).ptr(),
         GURL("http://b.com/"));
     event_router->DispatchEventToRenderers("test.onMessage",
-        "[{\"lastMessage\":true,\"data\":\"last message\"}]",
+        BuildEventArguments(true, "last message"),
         content::Source<Profile>(source).ptr(),
         GURL());
   }
 
   content::NotificationRegistrar registrar_;
 };
 
 }  // namespace
 
 // Tests that message passing between extensions and content scripts works.
@@ skipping 13 matching lines @@
 
   ASSERT_TRUE(RunExtensionTest("messaging/connect_external")) << message_;
 }
 
 // Tests that messages with event_urls are only passed to extensions with
 // appropriate permissions.
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, MessagingEventURL) {
   MessageSender sender;
   ASSERT_TRUE(RunExtensionTest("messaging/event_url")) << message_;
 }