1. add background for keyboard review
2. add text for showing selected keyboard's name
Test: Verified on device
Bug: 305588594
Change-Id: Icf0f2b7798cc5cbddefc1b3a95480b48271b276f
Demo video as attached in bug.
Add new image view for keyboard layout review.
Reuse NewKeyboardLayoutPickerController under
NewKeyboardLayoutPickerFragment when get update for keyboard layout, get
preview image from inputManager and set to the view.
This feature will be guided with keyboard_layout_preview_flag, if the
flag is off, preview image from InputManager will be null.
Bug: 305588594
Test: Verified on device
Change-Id: Ic6f8e469d3cf7114dab6935304706ad42bf83608