Add notification dots and popup menu notification support to the taskbar.

- Added support for notification dots
- Added support for notifications in popup menu
- Added support for dismissing notifications from the popup menu

Bug: 198438631
Test: long pressed launcher and taskbar icons, clicked notifications, clicked shortcuts
Change-Id: I7c981e60a82b4d6ce28332d804bbbfb5eb89c6a8

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

@@ -35,6 +35,7 @@ import com.android.launcher3.anim.AnimatorPlaybackController;
 import com.android.launcher3.anim.PendingAnimation;
 import com.android.launcher3.folder.FolderIcon;
 import com.android.launcher3.model.data.ItemInfo;
+import com.android.launcher3.util.LauncherBindableItemsContainer;
 import com.android.launcher3.util.MultiValueAlpha;
 import com.android.quickstep.AnimatedFloat;
 
@@ -243,6 +244,10 @@ public class TaskbarViewController {
         mTaskbarNavButtonTranslationY.updateValue(-deviceProfile.getTaskbarOffsetY());
     }
 
+    public void mapOverItems(LauncherBindableItemsContainer.ItemOperator op) {
+        mTaskbarView.mapOverItems(op);
+    }
+
     /**
      * Returns whether the given MotionEvent, *in screen coorindates*, is within any Taskbar item's
      * touch bounds.