Chromium change: https://github.com/chromium/chromium/commit/b5793f250f73c63638bbf237494bd3403217aec1 Opt-in predictive back gesture navigation on Android T After flag is enabled, keycode_back will not be sent any more on Android T. And so any components relying on keycode_back must use BackPressManager on T. FindToolbar and UrlBar will intercept back press in ChromeActivity's handleBackPressed if BackPressManager is disabled on T+. https://crrev.com/c/3920153 SearchActivity will opt in predictive back gesture on T+ no matter if BackPressManager is enabled . Demo: https://drive.google.com/file/d/1qnFx-e9YJdLo78T61sSJ5Oi1HiQ5CVuP/view?usp=sharing&resourcekey=0-DpSpUjine4qMpZ7b8Uxfew Bug: 1279941