Add filegroups used in api-stubs generation.

Bug: b/70351683
Test: m api-stubs-doc
Change-Id: I3432c1b3e31642dd49956fd8a0b68ee0a8fd6622
diff --git a/Android.bp b/Android.bp
index a47266b..7447b41 100644
--- a/Android.bp
+++ b/Android.bp
@@ -1 +1,16 @@
 subdirs=["tools"]
+
+filegroup {
+    name: "api-version-xml",
+    srcs: [
+        "api/*.xml",
+        "api/*.txt",
+    ],
+}
+
+filegroup {
+    name: "current-support-api",
+    srcs: [
+        "current/support-api.txt",
+    ],
+}