Add comment for surfaceflinger atoms

Add a comment about the surfaceflinger copy of atoms so that both will
be kept in sync.

Test: m
Bug: 184698814
Change-Id: I931ca94d30a55462a6133751126119d057f8e24a
diff --git a/stats/atoms.proto b/stats/atoms.proto
index e160e1f..48a825d 100644
--- a/stats/atoms.proto
+++ b/stats/atoms.proto
@@ -10525,6 +10525,9 @@
 /**
  * Global display pipeline metrics reported by SurfaceFlinger.
  * Metrics exist beginning in Android 11.
+ * There is a copy of this proto in timestats_atoms.proto in SurfaceFlinger.
+ * That proto must be updated if this atom is updated.
+ *
  * Pulled from:
  *    frameworks/native/services/surfaceflinger/TimeStats/TimeStats.cpp
  */
@@ -10639,6 +10642,9 @@
  * Per-layer display pipeline metrics reported by SurfaceFlinger.
  * Metrics exist beginning in Android 11.
  * The number of layers uploaded may be restricted due to size limitations.
+ * There is a copy of this proto in timestats_atoms.proto in SurfaceFlinger.
+ * That proto must be updated if this atom is updated.
+ *
  * Pulled from:
  *    frameworks/native/services/surfaceflinger/TimeStats/TimeStats.cpp
  */