Drop queued IPC messages if the child process dies while spawning

content/browser/child_process_launcher.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_BROWSER_CHILD_PROCESS_LAUNCHER_H_
 #define CONTENT_BROWSER_CHILD_PROCESS_LAUNCHER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/process/kill.h"
@@ skipping 58 matching lines @@
                                                     int* exit_code);
 
   // Changes whether the process runs in the background or not.  Only call
   // this after the process has started.
   void SetProcessBackgrounded(bool background);
 
   // Controls whether the child process should be terminated on browser
   // shutdown.
   void SetTerminateChildOnShutdown(bool terminate_on_shutdown);
 
+  // Replaces the ChildProcessLauncher::Client for testing purposes. Returns the
+  // previous  client.
+  Client* ReplaceClientForTest(Client* client);
+
  private:
   class Context;
 
   scoped_refptr<Context> context_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildProcessLauncher);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_CHILD_PROCESS_LAUNCHER_H_