Add proto output of statsd stats in adb

Test: statsd unit tests
Test: visually verified output of adb shell cmd stats print-stats was
sane
Test: making a CTS test that uses proto output
Bug: b/77548658

Change-Id: Ie60d66b9883f109446745dfcef97b7fb6194a1ac
diff --git a/cmds/statsd/src/StatsService.h b/cmds/statsd/src/StatsService.h
index 8d2fd33..463e2fe 100644
--- a/cmds/statsd/src/StatsService.h
+++ b/cmds/statsd/src/StatsService.h
@@ -149,9 +149,9 @@
                                          uint32_t serial);
 
     /**
-     * Text output of dumpsys.
+     * Text or proto output of dumpsys.
      */
-    void dump_impl(FILE* out, bool verbose);
+    void dump_impl(FILE* out, bool verbose, bool proto);
 
     /**
      * Print usage information for the commands