Pass error messages from native messaging to web-app.

remoting/host/setup/me2me_native_messaging_host.cc

Index: remoting/host/setup/me2me_native_messaging_host.cc
diff --git a/remoting/host/setup/me2me_native_messaging_host.cc b/remoting/host/setup/me2me_native_messaging_host.cc
index d2957fdf8c5a0c276be641e503aec965714f72f1..49d2b74588ed3d590647d5430a8d1d80c3cfb025 100644
--- a/remoting/host/setup/me2me_native_messaging_host.cc
+++ b/remoting/host/setup/me2me_native_messaging_host.cc
@@ -83,6 +83,9 @@ Me2MeNativeMessagingHost::Me2MeNativeMessagingHost(
       parent_window_handle_(parent_window_handle),
 #endif
       channel_(channel.Pass()),
+      log_message_handler_(
+          base::Bind(&extensions::NativeMessagingChannel::SendMessage,
+                     base::Unretained(channel_.get()))),
       daemon_controller_(daemon_controller),
       pairing_registry_(pairing_registry),
       oauth_client_(oauth_client.Pass()),