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

chrome/browser/extensions/api/messaging/message_service.cc

Index: chrome/browser/extensions/api/messaging/message_service.cc
diff --git a/chrome/browser/extensions/api/messaging/message_service.cc b/chrome/browser/extensions/api/messaging/message_service.cc
index 169e1b5096d77db22049b9280999d039f45ae008..3d374b7a4513dec3774e52ea679ba1fe05b70017 100644
--- a/chrome/browser/extensions/api/messaging/message_service.cc
+++ b/chrome/browser/extensions/api/messaging/message_service.cc
@@ -6,6 +6,7 @@
 
 #include "base/atomic_sequence_num.h"
 #include "base/bind.h"
+#include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/json/json_writer.h"
 #include "base/lazy_instance.h"
@@ -429,7 +430,7 @@ void MessageService::CloseChannelImpl(
 }
 
 void MessageService::PostMessage(
-    int source_port_id, const std::string& message) {
+    int source_port_id, scoped_ptr<base::ListValue> message) {
   int channel_id = GET_CHANNEL_ID(source_port_id);
   MessageChannelMap::iterator iter = channels_.find(channel_id);
   if (iter == channels_.end()) {
@@ -440,7 +441,9 @@ void MessageService::PostMessage(
       lazy_background_task_queue_->AddPendingTask(
           pending->second.first, pending->second.second,
           base::Bind(&MessageService::PendingPostMessage,
-                     weak_factory_.GetWeakPtr(), source_port_id, message));
+                     weak_factory_.GetWeakPtr(),
+                     source_port_id,
+                     base::Passed(&message)));
     }
     return;
   }
@@ -450,12 +453,13 @@ void MessageService::PostMessage(
   MessagePort* port = IS_OPENER_PORT_ID(dest_port_id) ?
       iter->second->opener.get() : iter->second->receiver.get();
 
-  port->DispatchOnMessage(message, dest_port_id);
+  port->DispatchOnMessage(message.Pass(), dest_port_id);
 }
 
-void MessageService::PostMessageFromNativeProcess(int port_id,
-                                                  const std::string& message) {
-  PostMessage(port_id, message);
+void MessageService::PostMessageFromNativeProcess(
+    int port_id,
+    scoped_ptr<base::ListValue> message) {
+  PostMessage(port_id, message.Pass());
 }
 
 void MessageService::Observe(int type,