Add blueprint file for the switcher script

This enables the build system to use the switcher script (switcher4.py)
for builds.

Bug: 128540915
Test: N/A
Change-Id: I7bfe3161bf3da8f19c504fcb7edc08f0cc9e26e7
diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..6e38175
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,27 @@
+// Copyright (C) 2019 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+python_binary_host {
+    name: "switcher4",
+    srcs: ["switcher4.py",],
+
+    version: {
+        py2: {
+            enabled: true,
+        },
+        py3: {
+            enabled: false,
+        },
+    },
+}