Add a load_status callback hook that is invoked at the end of chrome LoadApp.

src/public/chrome_main.h

 /*
  * Copyright (c) 2012 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef NATIVE_CLIENT_SRC_PUBLIC_CHROME_MAIN_H_
 #define NATIVE_CLIENT_SRC_PUBLIC_CHROME_MAIN_H_ 1
 
 #include "native_client/src/include/build_config.h"
@@ skipping 216 matching lines @@
 void NaClChromeMainInit(void);
 
 /*
  * Sets a function to be called when a fatal error is logged. When the passed
  * function is invoked, recent log messages will be passed in the data
  * parameter, and its length in the bytes parameter.
  * This function is only safe to call after NaClChromeMainInit().
  */
 void NaClSetFatalErrorCallback(void (*func)(const char *data, size_t bytes));
 
+/*
+ * Sets a function to be called when the initial module load status
+ * from a call to NaClChromeMainStart is known (load_status is a value from
+ * the the NaClErrorCode enumeration and may indicate success or error).
+ */
+void NaClSetLoadStatusCallback(void (*func)(int load_status));

[Mark Seaborn, 2015/04/17 23:15:54]

Can you make this callback a field in NaClChromeMainArgs rather than a global,
please?

NaClSetFatalErrorCallback() only sets a global because it affects how
NaClLog()+LOG_FATAL is handled.

[jvoung (off chromium), 2015/04/18 00:58:17]

Done -- ah, didn't realize why that was global.

+
 /* Create a new args struct containing default values. */
 struct NaClChromeMainArgs *NaClChromeMainArgsCreate(void);
 
 /*
  * Start NaCl.
  * On success, returns 1 and sets exit_status to the value that the application
  * passed to _exit().
  * Returns 0 if the application fails to start.
  */
 int NaClChromeMainStart(struct NaClApp *nap,
                         struct NaClChromeMainArgs *args,
                         int *exit_status);
 
 /*
  * NaClExit() is for doing a graceful exit, when no internal errors
  * have been detected, when the caller wants to return a well-defined
  * exit status.
  *
  * This is safer than exit(), which does some teardown that can cause running
  * threads to crash.
  */
 void NaClExit(int code);
 
 EXTERN_C_END
 
 #endif