Make Class.getPackageName public.

Import from 11+28.

Test: PackageTest, OldClassTest.
Change-Id: I1d65c1e1b49a24fd67eb4f5f8378213ba9304aba
diff --git a/api/current.txt b/api/current.txt
index 41dcf35..cbe93be 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -2834,6 +2834,7 @@
     method public int getModifiers();
     method @NonNull public String getName();
     method @Nullable public Package getPackage();
+    method @NonNull public String getPackageName();
     method @Nullable public java.security.ProtectionDomain getProtectionDomain();
     method @Nullable public java.net.URL getResource(@NonNull String);
     method @Nullable public java.io.InputStream getResourceAsStream(@NonNull String);