This adds some plumbing for propagating the reason for a renderer's death

chrome/common/result_codes.h

 // Copyright (c) 2010 The Chromium 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 CHROME_COMMON_RESULT_CODES_H_
 #define CHROME_COMMON_RESULT_CODES_H_
 #pragma once
 
 #include "base/process_util.h"
 
 // This file consolidates all the return codes for the browser and renderer
 // process. The return code is the value that:
 // a) is returned by main() or winmain(), or
 // b) specified in the call for ExitProcess() or TerminateProcess(), or
 // c) the exception value that causes a process to terminate.
 //
 // It is advisable to not use negative numbers because the Windows API returns
 // it as an unsigned long and the exception values have high numbers. For
 // example EXCEPTION_ACCESS_VIOLATION value is 0xC0000005.
 
 class ResultCodes {
  public:
   enum ExitCode {
-    NORMAL_EXIT = base::PROCESS_END_NORMAL_TERMINATION,
-    TASKMAN_KILL = base::PROCESS_END_KILLED_BY_USER,
-    HUNG = base::PROCESS_END_PROCESS_WAS_HUNG,
+    NORMAL_EXIT = 0,            // Process terminated normally.
+    KILLED = 1,                 // Process was killed by user or system.
+    HUNG = 2,                   // Process hung.
     INVALID_CMDLINE_URL,        // An invalid command line url was given.
     SBOX_INIT_FAILED,           // The sandbox could not be initialized.
     GOOGLE_UPDATE_INIT_FAILED,  // The Google Update client stub init failed.
     GOOGLE_UPDATE_LAUNCH_FAILED,// Google Update could not launch chrome DLL.
     BAD_PROCESS_TYPE,           // The process is of an unknown type.
     MISSING_PATH,               // An critical chrome path is missing.
     MISSING_DATA,               // A critical chrome file is missing.
     SHELL_INTEGRATION_FAILED,   // Failed to make Chrome default browser.
     MACHINE_LEVEL_INSTALL_EXISTS, // Machine level install exists
     UNINSTALL_DELETE_FILE_ERROR,// Error while deleting shortcuts.
@@ skipping 20 matching lines @@
 
     PROFILE_IN_USE,             // The profile was in use on another host.
 
     UNINSTALL_EXTENSION_ERROR,  // Failed to silently uninstall an extension.
 
     EXIT_LAST_CODE              // Last return code (keep it last).
   };
 };
 
 #endif  // CHROME_COMMON_RESULT_CODES_H_