Add A11y SUW hub page. Minor alterations of

Magnification screen to be consistent wtih most
recent desigs.

Change-Id: I191f6f66edb26597db6f4ed41311998b8ce26ca4

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);