Replace JSON (de)serialization of extension messages with direct Value pickling.

chrome/browser/extensions/api/messaging/extension_message_port.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 "chrome/browser/extensions/api/messaging/extension_message_port.h"
 
+#include "base/values.h"
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/browser/extensions/extension_process_manager.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/background_info.h"
 #include "chrome/common/extensions/extension_messages.h"
 #include "content/public/browser/render_process_host.h"
 
 namespace extensions {
 
@@ skipping 21 matching lines @@
       routing_id_, dest_port_id, channel_name, source_tab, info));
 }
 
 void ExtensionMessagePort::DispatchOnDisconnect(
     int source_port_id,
     const std::string& error_message) {
   process_->Send(new ExtensionMsg_DispatchOnDisconnect(
       routing_id_, source_port_id, error_message));
 }
 
-void ExtensionMessagePort::DispatchOnMessage(const std::string& message,
-                                             int target_port_id) {
-    process_->Send(new ExtensionMsg_DeliverMessage(
-        routing_id_, target_port_id, message));
+void ExtensionMessagePort::DispatchOnMessage(
+    scoped_ptr<base::ListValue> message,
+    int target_port_id) {
+  process_->Send(new ExtensionMsg_DeliverMessage(
+      routing_id_, target_port_id, *message));
 }
 
 void ExtensionMessagePort::IncrementLazyKeepaliveCount() {
   Profile* profile =
       Profile::FromBrowserContext(process_->GetBrowserContext());
   ExtensionProcessManager* pm =
       ExtensionSystem::Get(profile)->process_manager();
   ExtensionHost* host = pm->GetBackgroundHostForExtension(extension_id_);
   if (host && BackgroundInfo::HasLazyBackgroundPage(host->extension()))
     pm->IncrementLazyKeepaliveCount(host->extension());
@@ skipping 11 matching lines @@
   ExtensionHost* host = pm->GetBackgroundHostForExtension(extension_id_);
   if (host && host == background_host_ptr_)
     pm->DecrementLazyKeepaliveCount(host->extension());
 }
 
 content::RenderProcessHost* ExtensionMessagePort::GetRenderProcessHost() {
   return process_;
 }
 
 }  // namespace extensions