Flutter UI integration tests

This project contains a collection of non-plugin-dependent UI integration tests. The device code is in the lib/ directory, the driver code is in the test_driver/ directory. They work together. Normally they are run via the devicelab.

keyboard_resize

Verifies that showing and hiding the keyboard resizes the content.

keyboard_inset_jump

Verifies that showing and hiding the keyboard in edge-to-edge mode does not produce terminal insets jumps or discontinuous animation steps (validates fix for #190974).

routing

Verifies that flutter drive --route works correctly.