Segregate UMA metrics for production scenarios from test scenarios.

Currently we separate the UMA metrics only by one category: whether the
device is in dev mode or not. In addition, we need to exclude the noise
from these two categories:
1. Most of our testing on MP-signed images which are performed
with autest.
2. All our hwlab tests run in non-dev mode but they use dev-signed images
with dev-firmware keys.

So this CL defines additional bit fields to represent these states and
if any of these three flags are set, the UMA metric is sent to a
DevModeErrorCodes bucket. Thus the NormalErrorCodes bucket will have only
the production errors and thus we can monitor more effectively.

BUG=chromium-os:37613
TEST=Updated unit tests, ran on ZGB for all scenarios.
Change-Id: Id9cce33f09d1cc50cb15e67c731f7548940cbc24
Reviewed-on: https://gerrit.chromium.org/gerrit/41103
Reviewed-by: Chris Sosa <sosa@chromium.org>
Commit-Queue: Jay Srinivasan <jaysri@chromium.org>
Tested-by: Jay Srinivasan <jaysri@chromium.org>
diff --git a/omaha_request_action.cc b/omaha_request_action.cc
index 679d326..edfea53 100644
--- a/omaha_request_action.cc
+++ b/omaha_request_action.cc
@@ -20,6 +20,7 @@
 
 #include "update_engine/action_pipe.h"
 #include "update_engine/omaha_request_params.h"
+#include "update_engine/payload_state_interface.h"
 #include "update_engine/prefs_interface.h"
 #include "update_engine/utils.h"