Root cause: SpannableStringBuilder cannot handle the preference title is
empty caes.
Solution: Assign default value in test case setup.
Bug: 188448957
Test: make RunSettingsRoboTests -j52 ROBOTEST_FILTER=AccessibilityButtonFooterPreferenceControllerTest
Test: make RunSettingsRoboTests -j52 ROBOTEST_FILTER=AccessibilityControlTimeoutFooterPreferenceControllerTest
Test: make RunSettingsRoboTests -j52 ROBOTEST_FILTER=CaptionFooterPreferenceControllerTest
Test: make RunSettingsRoboTests -j52 ROBOTEST_FILTER=ToggleAutoclickFooterPreferenceControllerTest
Change-Id: Ia95a6ecba824d81e0ccf649975517231ecf475b3
1. Implement API extends Material Next FooterBarPreference and support Accessibility API for icons
2. Apply solutions to accessibility tools and framework tools in
accessibility settings page.
3. Apply DashboardFragment for Caption preference for xml parser
Bug: 185973304
Test: make RunSettingsRoboTests -j52
Change-Id: I6b80bc80190d6666e3fbcd462442a9f2c0e60bba