plugins#1373: [shared_preferences] Add contains method

plugins#1470: [video_player] Android: Added missing event.put(“event”, “completed”);

flutter#25329: [WebView] Allow the webview to take control when a URL is about to be loaded

Tool Changes

Last but certainly not least, we made a number of tooling changes in the core Flutter repos to improve the developer experience, particularly when it comes to improving hot reload performance (and you thought it was fast before!).

flutter#29693: Use source list from the compiler to track invalidated files for hot reload.

flutter#28152: Improve hot reload performance

flutter#29494: initial work on coverage generating script for tool

flutter#31171: Allow disabling all fingerprint caches via environment variable