No-op refactor on EmergencyGesturePreferenceController.

Move custom intent launching logic into a separate controller
(EmergencyGestureEntrypointPreferenceController).

This is in preparation of a mini-IA refresh and fixing a search
bug. The custom intent logic is only needed by the entrypoint
pref, and putting in the gesture PrefControler makes any fix
hard to implement.

Bug: 171067360
Bug: 172609395
Test: RunSettingsRoboTests
Change-Id: I1e26393872bfada98db80a1cc33e3e13dacb086b

src/com/android/settings/gestures/EmergencyGestureSoundPreferenceController.java

@@ -22,12 +22,11 @@ import android.provider.Settings;
 import androidx.annotation.VisibleForTesting;
 
 import com.android.settings.R;
-import com.android.settings.core.TogglePreferenceController;
 
 /**
  * Preference controller for emergency sos gesture setting
  */
-public class EmergencyGestureSoundPreferenceController extends TogglePreferenceController {
+public class EmergencyGestureSoundPreferenceController extends GesturePreferenceController {
 
     @VisibleForTesting
     static final int ON = 1;
@@ -40,6 +39,11 @@ public class EmergencyGestureSoundPreferenceController extends TogglePreferenceC
         super(context, key);
     }
 
+    @Override
+    protected String getVideoPrefKey() {
+        return "emergency_gesture_screen_video";
+    }
+
     private static boolean isGestureAvailable(Context context) {
         return context.getResources()
                 .getBoolean(R.bool.config_show_emergency_gesture_settings);