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/gestures/DoubleTapScreenSettings.java

@@ -54,8 +54,8 @@ public class DoubleTapScreenSettings extends DashboardFragment {
     @Override
     protected List<PreferenceController> getPreferenceControllers(Context context) {
         final List<PreferenceController> controllers = new ArrayList<>();
-        controllers.add(new DoubleTapScreenPreferenceController(
-                context, new AmbientDisplayConfiguration(context), UserHandle.myUserId()));
+        controllers.add(new DoubleTapScreenPreferenceController(context, getLifecycle(),
+                new AmbientDisplayConfiguration(context), UserHandle.myUserId()));
         return controllers;
     }
 }