Add enum value kErrorCodeFirstActiveOmahaPingSentPersistenceError

Add enum value kErrorCodeFirstActiveOmahaPingSentPersistenceError to enum UpdateEngineErrorCode.

Bug: 833980

Change-Id: I092149a7ceb608898587a37e3aaab5c520db95ff
Reviewed-on: https://chromium-review.googlesource.com/1062659Reviewed-by: Xiaochu Liu <xiaochu@chromium.org>
Commit-Queue: Amin Hassani <ahassani@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560835}

tools/metrics/histograms/enums.xml

@@ -45880,6 +45880,7 @@ Full version information for the fingerprint enum values:
   <int value="52" label="kErrorCodeUpdatedButNotActive"/>
   <int value="53" label="kErrorCodeNoUpdate"/>
   <int value="54" label="kErrorCodeRollbackNotPossible"/>
+  <int value="55" label="kErrorCodeFirstActiveOmahaPingSentPersistenceError"/>
 </enum>
 
 <enum name="UpdateEngineInstallDateProvisioningSource">