Rename writeToProto to be dumpDebug

We want to eventually migrate some of these APIs to be @SystemApi for mainline modules.
The #dumpDebug name is more appropriate than #writeToProto.

Bug: 142279786
Test: Manual
Change-Id: I60793e91cedf6b720d4ecef6a8484f4fed4ff30f
diff --git a/services/core/java/com/android/server/wm/ActivityMetricsLogger.java b/services/core/java/com/android/server/wm/ActivityMetricsLogger.java
index de51d4b..20d1d1c 100644
--- a/services/core/java/com/android/server/wm/ActivityMetricsLogger.java
+++ b/services/core/java/com/android/server/wm/ActivityMetricsLogger.java
@@ -1182,7 +1182,7 @@
         final ProtoOutputStream protoOutputStream =
                 new ProtoOutputStream(LAUNCH_OBSERVER_ACTIVITY_RECORD_PROTO_CHUNK_SIZE);
         // Write this data out as the top-most ActivityRecordProto (i.e. it is not a sub-object).
-        record.writeToProto(protoOutputStream);
+        record.dumpDebug(protoOutputStream);
         final byte[] bytes = protoOutputStream.getBytes();
 
         Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);