Add A11y SUW hub page after verifying build fix.

Original CL: 
https://googleplex-android-review.git.corp.google.com/#/c/828444/.

Diff (fixes build and adds a period):
https://googleplex-android-review.git.corp.google.com/#/c/841247/

This reverts commit 44be967e95.

Change-Id: I971806022dcd791de2d7819fa19df7801f51b673

src/com/android/settings/accessibility/AccessibilitySettings.java

@@ -554,6 +554,7 @@ public class AccessibilitySettings extends SettingsPreferenceFragment implements
         }
         mToggleLargeTextPreference.setChecked(mCurConfig.fontScale == LARGE_FONT_SCALE);
 
+        // Text contrast.
         mToggleHighTextContrastPreference.setChecked(
                 Settings.Secure.getInt(getContentResolver(),
                         Settings.Secure.ACCESSIBILITY_HIGH_TEXT_CONTRAST_ENABLED, 0) == 1);