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

chrome/browser/profile_import_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_PROFILE_IMPORT_PROCESS_HOST_H_
 #define CHROME_BROWSER_PROFILE_IMPORT_PROCESS_HOST_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 22 matching lines @@
   // ProfileImportProcessHost calls the client's functions on the thread passed
   // to it when it's created.
   class ImportProcessClient :
       public base::RefCountedThreadSafe<ImportProcessClient> {
    public:
     ImportProcessClient();
 
     // These methods are used by the ProfileImportProcessHost to pass messages
     // received from the external process back to the ImportProcessClient in
     // ImporterHost.
-    virtual void OnProcessCrashed() {}
+    virtual void OnProcessCrashed(int exit_status) {}
     virtual void OnImportStart() {}
     virtual void OnImportFinished(bool succeeded, std::string error_msg) {}
     virtual void OnImportItemStart(int item) {}
     virtual void OnImportItemFinished(int item) {}
     virtual void OnImportItemFailed(std::string error_msg) {}
 
     // These methods pass back data to be written to the user's profile from
     // the external process to the process host client.
     virtual void OnHistoryImportStart(size_t total_history_rows_count) {}
     virtual void OnHistoryImportGroup(
@@ skipping 65 matching lines @@
 
  private:
   // Launch the new process.
   bool StartProcess();
 
   // Called by the external importer process to send messages back to the
   // ImportProcessClient.
   void OnMessageReceived(const IPC::Message& message);
 
   // Overridden from BrowserChildProcessHost:
-  virtual void OnProcessCrashed();
+  virtual void OnProcessCrashed(int exit_code);
   virtual bool CanShutdown();
   virtual URLRequestContext* GetRequestContext(
       uint32 request_id,
       const ViewHostMsg_Resource_Request& request_data);
 
   // Receives messages to be passed back to the importer host.
   scoped_refptr<ImportProcessClient> import_process_client_;
 
   // The thread where the import_process_client_ lives.
   BrowserThread::ID thread_id_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileImportProcessHost);
 };
 
 #endif  // CHROME_BROWSER_PROFILE_IMPORT_PROCESS_HOST_H_