12354 java lints (cla: yes)

12355 skip flaky test (cla: yes)

12359 Forwards Flutter View to platform views and detaches when needed. (cla: yes)

12362 Fixes race condition that was reported internally. (cla: yes)

12363 Track “mouse leave” event (cla: yes, platform-windows)

12364 Revert “Reland “Smooth out iOS irregular input events delivery” (#12280)” (cla: yes)

12370 Added a default entrypoint variable to match android syntax. (cla: yes)

12373 Added unit tests for method channels. (cla: yes)

12375 Sync dart_runner (cla: yes)