Input settings: Show keyboard layout collection.

E.g. Android keyboard or Nexus Compat keyboard.

Bug: 27250977
Change-Id: Icd256a760b157418f52046f10ca272561b692838

src/com/android/settings/inputmethod/KeyboardLayoutPickerFragment2.java

@@ -146,6 +146,7 @@ public final class KeyboardLayoutPickerFragment2 extends SettingsPreferenceFragm
         for (KeyboardLayout layout : mKeyboardLayouts) {
             Preference pref = new Preference(getPrefContext());
             pref.setTitle(layout.getLabel());
+            pref.setSummary(layout.getCollection());
             root.addPreference(pref);
             mPreferenceMap.put(pref, layout);
         }