AU: Pass opened device fd from update engine to bspatch.

subprocess.h

 // Copyright (c) 2009 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 CHROMEOS_PLATFORM_UPDATE_ENGINE_SUBPROCESS_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_SUBPROCESS_H__
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 19 matching lines @@
 
   // Returns a tag > 0 on success.
   uint32_t Exec(const std::vector<std::string>& cmd,
                 ExecCallback callback,
                 void* p);
 
   // Used to cancel the callback. The process will still run to completion.
   void CancelExec(uint32_t tag);
 
   // Executes a command synchronously. Returns true on success.
+  static bool SynchronousExecFlags(const std::vector<std::string>& cmd,
+                                   int* return_code,
+                                   GSpawnFlags flags);
   static bool SynchronousExec(const std::vector<std::string>& cmd,
-                              int* return_code);
+                              int* return_code) {
+    return SynchronousExecFlags(cmd, return_code, static_cast<GSpawnFlags>(0));
+  }
 
   // Gets the one instance
   static Subprocess& Get() {
     return *subprocess_singleton_;
   }
   
   // Returns true iff there is at least one subprocess we're waiting on.
   bool SubprocessInFlight() {
     for (std::map<int, SubprocessCallbackRecord>::iterator it =
              callback_records_.begin();
@@ skipping 22 matching lines @@
 
   std::map<int, SubprocessCallbackRecord> callback_records_;
 
   Subprocess() {}
   DISALLOW_COPY_AND_ASSIGN(Subprocess);
 };
 
 }  // namespace chromeos_update_engine
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_SUBPROCESS_H__