Change running apps section to use GroupTask instead of AppInfo

- No longer bind All Apps to TaskbarRecentsController, and register
  RecentsModel.RecentTasksChangedListener instead
- The source of truth for "running tasks" in Desktop mode is the
  DesktopTask#tasks list itself, instead of
  RecentsModel.RunningTasksListener (which is no longer used)
- Added TaskInfo.TaskKey#isVisible to distinguish minimized running apps
- Next CL will hook up the UI for Recent/Running tasks that are
  not part of the Hotseat.

Flag: com.android.launcher3.enable_recents_in_taskbar
Test: TaskbarRecentAppsControllerTest
Fixes: 335398876
Bug: 315354060
Change-Id: I1313f97a791c5c0c1db7443a5d4f1d5bc761981f

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

@@ -224,7 +224,6 @@ public class TaskbarViewController implements TaskbarControllers.LoggableTaskbar
         }
         LauncherAppState.getInstance(mActivity).getModel().removeCallbacks(mModelCallbacks);
         mActivity.removeOnDeviceProfileChangeListener(mDeviceProfileChangeListener);
-        mModelCallbacks.unregisterListeners();
     }
 
     public boolean areIconsVisible() {
@@ -869,6 +868,11 @@ public class TaskbarViewController implements TaskbarControllers.LoggableTaskbar
         return mTaskbarView.isEventOverAnyItem(ev);
     }
 
+    /** Called when there's a change in running apps to update the UI. */
+    public void commitRunningAppsToUI() {
+        mModelCallbacks.commitRunningAppsToUI();
+    }
+
     @Override
     public void dumpLogs(String prefix, PrintWriter pw) {
         pw.println(prefix + "TaskbarViewController:");
@@ -889,14 +893,4 @@ public class TaskbarViewController implements TaskbarControllers.LoggableTaskbar
         mModelCallbacks.dumpLogs(prefix + "\t", pw);
     }
 
-    /** Called when there's a change in running apps to update the UI. */
-    public void commitRunningAppsToUI() {
-        mModelCallbacks.commitRunningAppsToUI();
-    }
-
-    /** Call TaskbarModelCallbacks to update running apps. */
-    public void updateRunningApps() {
-        mModelCallbacks.updateRunningApps();
-    }
-
 }