Set up a NaCl load status callback to start replacing "start_module".

components/nacl/renderer/trusted_plugin_channel.h

Index: components/nacl/renderer/trusted_plugin_channel.h
diff --git a/components/nacl/renderer/trusted_plugin_channel.h b/components/nacl/renderer/trusted_plugin_channel.h
index efeb5e8fe988834df922756ebb6924feef60d6ad..c4367aa9ed52fbbac8c9e74fe5e4d373b0a6c0e4 100644
--- a/components/nacl/renderer/trusted_plugin_channel.h
+++ b/components/nacl/renderer/trusted_plugin_channel.h
@@ -28,7 +28,7 @@ class TrustedPluginChannel : public IPC::Listener {
   TrustedPluginChannel(NexeLoadManager* nexe_load_manager,
                        const IPC::ChannelHandle& handle,
                        base::WaitableEvent* shutdown_event,
-                       bool report_exit_status);
+                       bool is_helper_nexe);
   ~TrustedPluginChannel() override;
 
   bool Send(IPC::Message* message);
@@ -38,13 +38,14 @@ class TrustedPluginChannel : public IPC::Listener {
   void OnChannelError() override;
 
   void OnReportExitStatus(int exit_status);
+  void OnReportLoadStatus(int load_status);
 
  private:
   // Non-owning pointer. This is safe because the TrustedPluginChannel is owned
   // by the NexeLoadManager pointed to here.
   NexeLoadManager* nexe_load_manager_;
   scoped_ptr<IPC::SyncChannel> channel_;
-  bool report_exit_status_;
+  bool is_helper_nexe_;
 
   DISALLOW_COPY_AND_ASSIGN(TrustedPluginChannel);
 };