Bug 934209 - support multi-row for key popup.

1. To address UI review comments about the interaction.
   - Enlarge the menu lock area.
   - Keep to select the last/first element when moving out of the menu
     edge.
2. Fix the vertical position for landscape mode.

3. Code review comments
 - Update the naming of menu view
 - Refine the menu related instances that manager holds
 - Fix integration test and unit tests.

4. UI - To address UI review comment for edge case.
Merge pull request #23182 from RudyLu/keyboard/Bug934209-multiRow_popup_commit

Bug 934209 - support multi-row for key popup.
r=timdream.