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

chrome/browser/utility_process_host.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_BROWSER_UTILITY_PROCESS_HOST_H_
 #define CHROME_BROWSER_UTILITY_PROCESS_HOST_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 21 matching lines @@
 class UtilityProcessHost : public BrowserChildProcessHost {
  public:
   // An interface to be implemented by consumers of the utility process to
   // get results back.  All functions are called on the thread passed along
   // to UtilityProcessHost.
   class Client : public base::RefCountedThreadSafe<Client> {
    public:
     Client() {}
 
     // Called when the process has crashed.
-    virtual void OnProcessCrashed() {}
+    virtual void OnProcessCrashed(int exit_code) {}
 
     // Called when the extension has unpacked successfully.  |manifest| is the
     // parsed manifest.json file.  |catalogs| contains list of all parsed
     // message catalogs.  |images| contains a list of decoded images and the
     // associated paths where those images live on disk.
     virtual void OnUnpackExtensionSucceeded(const DictionaryValue& manifest) {}
 
     // Called when an error occurred while unpacking the extension.
     // |error_message| contains a description of the problem.
     virtual void OnUnpackExtensionFailed(const std::string& error_message) {}
@@ skipping 93 matching lines @@
 
  private:
   // Starts a process if necessary.  Returns true if it succeeded or a process
   // has already been started via StartBatchMode().
   bool StartProcess(const FilePath& exposed_dir);
 
   // IPC messages:
   virtual void OnMessageReceived(const IPC::Message& message);
 
   // BrowserChildProcessHost:
-  virtual void OnProcessCrashed();
+  virtual void OnProcessCrashed(int exit_code);
   virtual bool CanShutdown() { return true; }
   virtual URLRequestContext* GetRequestContext(
       uint32 request_id,
       const ViewHostMsg_Resource_Request& request_data) {
     return NULL;
   }
 
   // A pointer to our client interface, who will be informed of progress.
   scoped_refptr<Client> client_;
   BrowserThread::ID client_thread_id_;
   // True when running in batch mode, i.e., StartBatchMode() has been called
   // and the utility process will run until EndBatchMode().
   bool is_batch_mode_;
 
   DISALLOW_COPY_AND_ASSIGN(UtilityProcessHost);
 };
 
 #endif  // CHROME_BROWSER_UTILITY_PROCESS_HOST_H_