Adding a utility class to simplify main process initialization.

Change-Id: I796cf758d2a25cf8fd5f9a9b78a7977fd54ca451
diff --git a/res/values/config.xml b/res/values/config.xml
index 3dddac2..065ad36 100644
--- a/res/values/config.xml
+++ b/res/values/config.xml
@@ -101,6 +101,9 @@
     <!-- Name of a subclass of com.android.launcher3.util.InstantAppResolver. Can be empty. -->
     <string name="instant_app_resolver_class" translatable="false"></string>
 
+    <!-- Name of a main process initializer class. -->
+    <string name="main_process_initializer_class" translatable="false"></string>
+
     <!-- Package name of the default wallpaper picker. -->
     <string name="wallpaper_picker_package" translatable="false"></string>