am d8fbc188: am b42d5107: am a6ddccbb: am e9a0bb71: am 5f8ef515: am 0255eb04: am 9827c718: Merge "Fix roundtrip failure with groups when unknown fields are enabled."

* commit 'd8fbc18826e4945c45b22b5d36d5e07deb08bf0a':