Add the language switcher to the packages and classes pages for the Android Platform. am: e29e5c7cda

Original change: https://googleplex-android-review.googlesource.com/c/platform/tools/doc_generation/+/12754696

Change-Id: I7ecbbf6c1ab71954c56efa6133b1aaaf22758636
tree: f95263c33a855c69a499c737fe82a0ab9970ddd7
  1. Android.bp
  2. switcher4.py