Fix getAnimationTargets so that it returns valid animation target

AppTransitionController#getAnimationTargets traverse ancestors of
activity to find animation targets. Previously it can reach
DisplayContent#mWindowContainers which does not inherit
WindowContainer#createRemoteAnimationTarget thus cannot be a remote
animation target.

After this CL, getAnimationTargets stops traversing if it reaches
WindowContainer which cannot be a remote animation target.

Bug: 149716548
Test: None
Change-Id: Ie94ab8ecd35e9dcc28d0b8f7aaeb058e15b0f80b

services/core/java/com/android/server/wm/ActivityRecord.java

@@ -7568,6 +7568,11 @@ final class ActivityRecord extends WindowToken implements WindowManagerService.A
                 record.mStartBounds);
     }
 
+    @Override
+    boolean canCreateRemoteAnimationTarget() {
+        return true;
+    }
+
     @Override
     void getAnimationFrames(Rect outFrame, Rect outInsets, Rect outStableInsets,
             Rect outSurfaceInsets) {

services/core/java/com/android/server/wm/AppTransitionController.java

@@ -446,7 +446,7 @@ public class AppTransitionController {
             siblings.add(current);
             boolean canPromote = true;
 
-            if (parent == null) {
+            if (parent == null || !parent.canCreateRemoteAnimationTarget()) {
                 canPromote = false;
             } else {
                 // In case a descendant of the parent belongs to the other group, we cannot promote

services/core/java/com/android/server/wm/Task.java

@@ -3087,6 +3087,11 @@ class Task extends WindowContainer<WindowContainer> {
         return activity != null ? activity.createRemoteAnimationTarget(record) : null;
     }
 
+    @Override
+    boolean canCreateRemoteAnimationTarget() {
+        return true;
+    }
+
     WindowState getTopVisibleAppMainWindow() {
         final ActivityRecord activity = getTopVisibleActivity();
         return activity != null ? activity.findMainWindow() : null;

services/core/java/com/android/server/wm/WindowContainer.java

@@ -2186,6 +2186,10 @@ class WindowContainer<E extends WindowContainer> extends ConfigurationContainer<
         return null;
     }
 
+    boolean canCreateRemoteAnimationTarget() {
+        return false;
+    }
+
     boolean okToDisplay() {
         final DisplayContent dc = getDisplayContent();
         return dc != null && dc.okToDisplay();