Enable proto lite shrinker in run_on_app.py

Change-Id: Ib6da6b7a063028995aeeb6fa2ae73cfafe3c6a03
diff --git a/tools/run_on_app.py b/tools/run_on_app.py
index d085653..0a41128 100755
--- a/tools/run_on_app.py
+++ b/tools/run_on_app.py
@@ -319,6 +319,7 @@
       extra_args.append('-Dcom.android.tools.r8.allowTypeErrors=1')
     if 'proto-shrinking' in values:
       extra_args.append('-Dcom.android.tools.r8.generatedExtensionRegistryShrinking=1')
+      extra_args.append('-Dcom.android.tools.r8.generatedMessageLiteShrinking=1')
 
   if not options.no_libraries and 'libraries' in values:
     for lib in values['libraries']: