Adding a utility class to listen for app launches

Change-Id: I62e82a6e04b7101773d98c6e7aec574facd053fe
diff --git a/res/values/config.xml b/res/values/config.xml
index 6bd01b5..4b68b50 100644
--- a/res/values/config.xml
+++ b/res/values/config.xml
@@ -70,6 +70,7 @@
     <string name="instant_app_resolver_class" translatable="false"></string>
     <string name="main_process_initializer_class" translatable="false"></string>
     <string name="system_shortcut_factory_class" translatable="false"></string>
+    <string name="app_launch_tracker_class" translatable="false"></string>
 
     <!-- Package name of the default wallpaper picker. -->
     <string name="wallpaper_picker_package" translatable="false"></string>