Reserving IDs in pushed atoms for a future feature.

Bug: 333882013
Change-Id: I56911dc9f64f24601f7914d7d602231dbe6ea82b
diff --git a/stats/atoms.proto b/stats/atoms.proto
index 849eb5c..820dc07 100644
--- a/stats/atoms.proto
+++ b/stats/atoms.proto
@@ -1221,6 +1221,8 @@
     extensions 875; // LeAdvErrorReported le_adv_error_reported
     extensions 876; // SelectAdsFromOutcomesApiCalled select_ads_from_outcomes_api_called
     extensions 877; // ReportImpressionApiCalled report_impression_api_called
+    extensions 878; // Reserved for b/333882013
+    extensions 879; // Reserved for b/333882013
     extensions 9999; // Atom9999 atom_9999
     // StatsdStats tracks platform atoms with ids up to 900.
     // Update StatsdStats::kMaxPushedAtomId when atom ids here approach that value.