Panels feature (suggestion)

[Lichtenshtein]

i guess this explanation from log is exactly for your situation:
"2.Extension panel now become default enabled(the same with Chrome).If you want your extension icons appearing at the end of location bar instead of tool bar, you can add a command line "--extension-action-redesign=0"(without quotes)."

No, i'm talking about these panels. They work in 2.1.9.50 (64-bit) (Chromium 53.0.2785.143).