Make container mandatory in aconfig_declarations.

Bug: 330354107
Test: Unit test and CI.

Ignore-AOSP-First: It is easier to detect all the missing ones in internal
master.
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:e916a2c758d2a95037d1d366e7cd0e10d241d510)
Merged-In: I4ab4271c67a35d0fdcc0b57c27260e29fb7dea56
Change-Id: I4ab4271c67a35d0fdcc0b57c27260e29fb7dea56
diff --git a/java/droidstubs_test.go b/java/droidstubs_test.go
index 8da695f..6a14f36 100644
--- a/java/droidstubs_test.go
+++ b/java/droidstubs_test.go
@@ -379,6 +379,7 @@
 	aconfig_declarations {
 		name: "bar",
 		package: "com.example.package",
+		container: "com.android.foo",
 		srcs: [
 			"bar.aconfig",
 		],
@@ -434,6 +435,7 @@
 	aconfig_declarations {
 		name: "bar",
 		package: "com.example.package",
+		container: "com.android.foo",
 		srcs: [
 			"bar.aconfig",
 		],