The label of shortcut preference and checkbook are overlapped, but only
the checkbox can be triggered.
Action: set parent layout to be non-selectable.
Bug: 149627994
Test: Manual test
Change-Id: Ic0b58159111c27ef94b10c6935178c3b80995d11
1. Use setWidgetLayoutResource() for the controllable widget at the
right side.
2. Improve listener structure.
3. Extend checkbox clickable area.
Bug: 142530063
Test: make -j52 RunSettingsRoboTests ROBOTEST_FILTER=ShortcutPreferenceTest
Change-Id: Iebb9f62653914a0d7200c627f01cf7953d576960
Create a new preference that could let users enable accessibility
shortcut and choose which shortcut type they prefer to use.
This CL only contains preference layout and functions interfaces.
Functions implementation will be added in next CL.
Bug: 142530063
Test: Maunal, make RunSettingsRoboTests
Change-Id: I69e832638547cd3f38da2192f22c7e219bbcc018