Add video to each gesture preference screen.

- Refactor GesturePreference to a generic VideoPreference.
- The old video_preference.xml is only for magnification video, so
  renamed.
- And use VideoPreference in gesture setting pages.
- Refactor common logic into GesturePreferenceController.

Bug: 32637613
Test: RunSettingsRoboTests

Change-Id: I58580b01a32873cb32c5dc5bf2ec021d5b1400cc

src/com/android/settings/notification/ConfigureNotificationSettings.java

@@ -62,7 +62,7 @@ public class ConfigureNotificationSettings extends DashboardFragment {
         mLockScreenNotificationController = new LockScreenNotificationPreferenceController(context);
         getLifecycle().addObserver(pulseController);
         getLifecycle().addObserver(mLockScreenNotificationController);
-        controllers.add(new SwipeToNotificationPreferenceController(context));
+        controllers.add(new SwipeToNotificationPreferenceController(context, getLifecycle()));
         controllers.add(pulseController);
         controllers.add(mLockScreenNotificationController);
         return controllers;