Fix EnterpriseDeviceManagementStatus UMA enum, add comments.

components/policy/core/common/policy_load_status.h

Index: components/policy/core/common/policy_load_status.h
diff --git a/components/policy/core/common/policy_load_status.h b/components/policy/core/common/policy_load_status.h
index 5f4d017536acc08e65e60c85e6d181748729d706..d22673b088934d32d3bf53dfb1b255e0d20b05c7 100644
--- a/components/policy/core/common/policy_load_status.h
+++ b/components/policy/core/common/policy_load_status.h
@@ -22,23 +22,23 @@ enum PolicyLoadStatus {
   // Policy load attempt started. This gets logged for each policy load attempt
   // to get a baseline on the number of requests, and an arbitrary number of
   // the below status codes may get added in addition.
-  POLICY_LOAD_STATUS_STARTED,
+  POLICY_LOAD_STATUS_STARTED = 0,
   // System failed to determine whether there's policy.
-  POLICY_LOAD_STATUS_QUERY_FAILED,
+  POLICY_LOAD_STATUS_QUERY_FAILED = 1,
   // No policy present.
-  POLICY_LOAD_STATUS_NO_POLICY,
+  POLICY_LOAD_STATUS_NO_POLICY = 2,
   // Data inaccessible, such as non-local policy file.
-  POLICY_LOAD_STATUS_INACCCESSIBLE,
+  POLICY_LOAD_STATUS_INACCCESSIBLE = 3,
   // Data missing, such as policy file not present.
-  POLICY_LOAD_STATUS_MISSING,
+  POLICY_LOAD_STATUS_MISSING = 4,
   // Trying with Wow64 redirection disabled.
-  POLICY_LOAD_STATUS_WOW64_REDIRECTION_DISABLED,
+  POLICY_LOAD_STATUS_WOW64_REDIRECTION_DISABLED = 5,
   // Data read error, for example file reading errors.
-  POLICY_LOAD_STATUS_READ_ERROR,
+  POLICY_LOAD_STATUS_READ_ERROR = 6,
   // Data too large to process.
-  POLICY_LOAD_STATUS_TOO_BIG,
+  POLICY_LOAD_STATUS_TOO_BIG = 7,
   // Parse error.
-  POLICY_LOAD_STATUS_PARSE_ERROR,
+  POLICY_LOAD_STATUS_PARSE_ERROR = 8,
 
   // This must stay last.
   POLICY_LOAD_STATUS_SIZE