Wire up process launch error codes.

content/public/browser/browser_child_process_host_delegate.h

 // Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_BROWSER_CHILD_PROCESS_HOST_DELEGATE_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_CHILD_PROCESS_HOST_DELEGATE_H_
 
 #include "content/common/content_export.h"
 #include "ipc/ipc_listener.h"
 
 namespace content {
 
 class ServiceRegistry;
 
 // Interface that all users of BrowserChildProcessHost need to provide.
 class CONTENT_EXPORT BrowserChildProcessHostDelegate : public IPC::Listener {
  public:
   ~BrowserChildProcessHostDelegate() override {}
 
   // Delegates return true if it's ok to shut down the child process (which is
   // the default return value). The exception is if the host is in the middle of
   // sending a request to the process, in which case the other side might think
   // it's ok to shutdown, when really it's not.
   virtual bool CanShutdown();
 
   // Called when the process has been started.
   virtual void OnProcessLaunched() {}
 
   // Called if the process failed to launch.  In this case the process never
-  // started so there is no available exit code.
-  virtual void OnProcessLaunchFailed() {}
+  // started so the code here is a platform specific error code.
+  virtual void OnProcessLaunchFailed(int error_code) {}
 
   // Called if the process crashed. |exit_code| is the status returned when the
   // process crashed (for posix, as returned from waitpid(), for Windows, as
   // returned from GetExitCodeProcess()).
   virtual void OnProcessCrashed(int exit_code) {}
 
   // Returns the ServiceRegistry for this child process.
   virtual ServiceRegistry* GetServiceRegistry();
 };
 
 };  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_BROWSER_CHILD_PROCESS_HOST_DELEGATE_H_