The platform view touch gesture has pretty complex logic but it has no integration test.

A few possible ideas:

• able to enable/disable some/all gestures on platform view
• GestureDetector able to get the touch callbacks
• if flutter side consumes all the touches, platform view shouldn't receive any touches
• if flutter side consumes some gestures (e.g. swipe up/down), platform view should receive remaining touches (pinch to scale)
• if flutter side doesn't consume touches, then platform view should handle them

See context: flutter-team-archive/engine#55724