Remove accessibility duplicates in settings search

Bug: 33701673
Test: make RunSettingsRoboTests
Change-Id: I46e79051d10c4cae851f8e76304e6cfe0a3f73d4
Merged-In: Idda6d2f98cb8d2cb91a9a4721b2ef84921f9056a

src/com/android/settings/DisplaySettings.java

@@ -50,6 +50,8 @@ import java.util.List;
 public class DisplaySettings extends DashboardFragment {
     private static final String TAG = "DisplaySettings";
 
+    public static final String KEY_DISPLAY_SIZE = "screen_zoom";
+
     private static final String KEY_AUTO_BRIGHTNESS = "auto_brightness";
     private static final String KEY_SCREEN_TIMEOUT = "screen_timeout";
 
@@ -122,6 +124,13 @@ public class DisplaySettings extends DashboardFragment {
                     return result;
                 }
 
+                @Override
+                public List<String> getNonIndexableKeys(Context context) {
+                    List<String> keys = new ArrayList<>();
+                    keys.add(KEY_DISPLAY_SIZE);
+                    return keys;
+                }
+
                 @Override
                 public List<PreferenceController> getPreferenceControllers(Context context) {
                     return buildPreferenceControllers(context, null);