Import async-trait crate.

Bug: 164106399
Bug: 158290206
Test: mm
Change-Id: I0c4a491b785134e4ac1d5572e5ff94b8699dc0bc
diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..6e5e11d
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,19 @@
+// This file is generated by cargo2android.py --run --device --dependencies.
+
+rust_proc_macro {
+    name: "libasync_trait",
+    crate_name: "async_trait",
+    srcs: ["src/lib.rs"],
+    edition: "2018",
+    rustlibs: [
+        "libproc_macro2",
+        "libquote",
+        "libsyn",
+    ],
+}
+
+// dependent_library ["feature_list"]
+//   proc-macro2-1.0.19 "default,proc-macro"
+//   quote-1.0.7 "default,proc-macro"
+//   syn-1.0.38 "clone-impls,default,derive,extra-traits,full,parsing,printing,proc-macro,quote,visit,visit-mut"
+//   unicode-xid-0.2.1 "default"