Create drop target for bubble bar

When dragging bubble bar in launcher, show drop target when drag passes
middle of the screen.

Bug: 330585397
Flag: ACONFIG com.android.wm.shell.enable_bubble_bar DEVELOPMENT
Test: manual
Change-Id: I52c3e9ac0b7c36e2207640baf75dc44300b522ef

quickstep/src/com/android/launcher3/taskbar/TaskbarActivityContext.java

@@ -98,6 +98,7 @@ import com.android.launcher3.taskbar.TaskbarAutohideSuspendController.AutohideSu
 import com.android.launcher3.taskbar.TaskbarTranslationController.TransitionCallback;
 import com.android.launcher3.taskbar.allapps.TaskbarAllAppsController;
 import com.android.launcher3.taskbar.bubbles.BubbleBarController;
+import com.android.launcher3.taskbar.bubbles.BubbleBarPinController;
 import com.android.launcher3.taskbar.bubbles.BubbleBarView;
 import com.android.launcher3.taskbar.bubbles.BubbleBarViewController;
 import com.android.launcher3.taskbar.bubbles.BubbleControllers;
@@ -254,7 +255,10 @@ public class TaskbarActivityContext extends BaseTaskbarContext {
                     new BubbleStashController(this),
                     new BubbleStashedHandleViewController(this, bubbleHandleView),
                     new BubbleDragController(this),
-                    new BubbleDismissController(this, mDragLayer)));
+                    new BubbleDismissController(this, mDragLayer),
+                    new BubbleBarPinController(this, mDragLayer,
+                            () -> getDeviceProfile().getDisplayInfo().currentSize)
+            ));
         }
 
         // Construct controllers.