Track API changes.

* Make `sInitialized` internal.

Test: Existing tests pass.
Change-Id: Iabc9a2e3bbd454173c9b2d933d8c2f3cc8234b0a
diff --git a/startup/startup-runtime/build.gradle b/startup/startup-runtime/build.gradle
index 5903954..6a4c794 100644
--- a/startup/startup-runtime/build.gradle
+++ b/startup/startup-runtime/build.gradle
@@ -52,7 +52,7 @@
 
 androidx {
     name = "Android App Startup Runtime"
-    publish = Publish.NONE
+    publish = Publish.SNAPSHOT_AND_RELEASE
     mavenGroup = LibraryGroups.STARTUP
     inceptionYear = "2020"
     description = "Android App Startup Runtime"