AU: Separate error codes for different OmahaRequestAction failures.

action_processor.h

Index: action_processor.h
diff --git a/action_processor.h b/action_processor.h
index 9bc4ef29500f69e49152c16a93185b481fecc519..2618c3961f0cb192e49d611a1ef2dacaba45c975 100644
--- a/action_processor.h
+++ b/action_processor.h
@@ -38,6 +38,12 @@ enum ActionExitCode {
   kActionCodeDownloadPayloadVerificationError = 12,
   kActionCodeDownloadAppliedUpdateVerificationError = 13,
   kActionCodeDownloadWriteError = 14,
+  kActionCodeOmahaRequestEmptyResponseError = 200,
+  kActionCodeOmahaRequestXMLParseError = 201,
+  kActionCodeOmahaRequestNoUpdateCheckNode = 202,
+  kActionCodeOmahaRequestNoUpdateCheckStatus = 203,
+  kActionCodeOmahaRequestBadUpdateCheckStatus = 204,
+  kActionCodeOmahaRequestHTTPResponseBase = 2000,  // + HTTP response code
 };
 
 class AbstractAction;