Support package_splits

Pass the package_splits list from the property to aapt2 as
--split arguments, sign the extra outputs, install them, and
add them as extra output files for SourceFileProducer.

Bug: 127921149
Test: TestAppSplits
Change-Id: Id94a53ae6a8a68ec81e98abba2fefc9c23feaa7a
diff --git a/java/androidmk.go b/java/androidmk.go
index 04b328d..533b82e 100644
--- a/java/androidmk.go
+++ b/java/androidmk.go
@@ -262,6 +262,10 @@
 				if len(app.dexpreopter.builtInstalled) > 0 {
 					fmt.Fprintln(w, "LOCAL_SOONG_BUILT_INSTALLED :=", app.dexpreopter.builtInstalled)
 				}
+				for _, split := range app.aapt.splits {
+					install := "$(LOCAL_MODULE_PATH)/" + strings.TrimSuffix(app.installApkName, ".apk") + split.suffix + ".apk"
+					fmt.Fprintln(w, "LOCAL_SOONG_BUILT_INSTALLED +=", split.path.String()+":"+install)
+				}
 			},
 		},
 	}