Add Python protobuf support.

Python protobuf std libs will be wrapped in final binary/test par file.

Bug: b/70568913
Test: manually create real examples.
Change-Id: I7376ec9175f3e03d1adbd20858a7f74e826387ad
diff --git a/Android.bp b/Android.bp
index 00db8f2d..9162926 100644
--- a/Android.bp
+++ b/Android.bp
@@ -267,6 +267,7 @@
         "python/defaults.go",
         "python/installer.go",
         "python/library.go",
+        "python/proto.go",
         "python/python.go",
         "python/test.go",
     ],