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..d657d5338e187d95de34eac1af8275abfd21f0d9 100644
--- a/components/nacl/renderer/trusted_plugin_channel.h
+++ b/components/nacl/renderer/trusted_plugin_channel.h
@@ -8,6 +8,7 @@
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "ipc/ipc_listener.h"
+#include "native_client/src/trusted/service_runtime/nacl_error_code.h"
 #include "ppapi/c/pp_instance.h"
 
 namespace base {
@@ -28,7 +29,7 @@ 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 +39,14 @@ class TrustedPluginChannel : public IPC::Listener {
   void OnChannelError() override;
 
   void OnReportExitStatus(int exit_status);
+  void OnReportLoadStatus(NaClErrorCode 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);
 };