Add and emit download action error codes.

action_processor.h

 // Copyright (c) 2010 The Chromium OS 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_ACTION_PROCESSOR_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_ACTION_PROCESSOR_H__
 
 #include <deque>
 
 #include "base/basictypes.h"
 
 // The structure of these classes (Action, ActionPipe, ActionProcessor, etc.)
 // is based on the KSAction* classes from the Google Update Engine code at
 // http://code.google.com/p/update-engine/ . The author of this file sends
 // a big thanks to that team for their high quality design, implementation,
 // and documentation.
 
 // See action.h for an overview of this class and other other Action* classes.
 
 // An ActionProcessor keeps a queue of Actions and processes them in order.
 
 namespace chromeos_update_engine {
 
 // Action exit codes.
 enum ActionExitCode {
   kActionCodeSuccess = 0,
   kActionCodeError = 1,
+  kActionCodeInstallDeviceOpenError = 2,
+  kActionCodeKernelDeviceOpenError = 3,
+  kActionCodeDownloadTransferError = 4,
+  kActionCodeDownloadHashMismatchError = 5,
 };
 
 class AbstractAction;
 class ActionProcessorDelegate;
 
 class ActionProcessor {
  public:
   ActionProcessor();
 
   ~ActionProcessor();
@@ skipping 58 matching lines @@
   // Called whenever an action has finished processing, either successfully
   // or otherwise.
   virtual void ActionCompleted(ActionProcessor* processor,
                                AbstractAction* action,
                                ActionExitCode code) {}
 };
 
 }  // namespace chromeos_update_engine
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_ACTION_PROCESSOR_H__