Filter recents view instances by package name

Filter instances of GroupTasks based on package name
as a part of support for multi-instance

Add a feature flag to toggle multi-instance features

See the video below for how to use the demo.
Note: some extra UI elements were added since video
was recorded, but the filtering process is the same.
http://recall/-/da585DRwKRZK3S2xxcQrSm/gW9HZnbCvGyH1DQiVizOW2

See go/multi-instance for more info about the feature

Bug: 253520408

Test: manually tested the instance filtering

Change-Id: I19c947ca353699096388b9fbbdca6d75cb0041a7

quickstep/src/com/android/quickstep/views/TaskView.java

@@ -526,6 +526,50 @@ public class TaskView extends FrameLayout implements Reusable {
         setOrientationState(orientedState);
     }
 
+    /**
+     * Sets up an on-click listener and the visibility for show_windows icon on top of the task.
+     */
+    public void setUpShowAllInstancesListener() {
+        String taskPackageName = mTaskIdAttributeContainer[0].mTask.key.getPackageName();
+
+        // icon of the top/left task
+        View showWindowsView = findViewById(R.id.show_windows);
+        updateFilterCallback(showWindowsView, getFilterUpdateCallback(taskPackageName));
+    }
+
+    /**
+     * Returns a callback that updates the state of the filter and the recents overview
+     *
+     * @param taskPackageName package name of the task to filter by
+     */
+    @Nullable
+    protected View.OnClickListener getFilterUpdateCallback(String taskPackageName) {
+        View.OnClickListener cb = (view) -> {
+            // update and apply a new filter
+            getRecentsView().setAndApplyFilter(taskPackageName);
+        };
+
+        if (!getRecentsView().getFilterState().shouldShowFilterUI(taskPackageName)) {
+            cb = null;
+        }
+        return cb;
+    }
+
+    /**
+     * Sets the correct visibility and callback on the provided filterView based on whether
+     * the callback is null or not
+     */
+    protected void updateFilterCallback(@NonNull View filterView,
+            @Nullable View.OnClickListener callback) {
+        if (callback == null) {
+            filterView.setVisibility(GONE);
+        } else {
+            filterView.setVisibility(VISIBLE);
+        }
+
+        filterView.setOnClickListener(callback);
+    }
+
     public TaskIdAttributeContainer[] getTaskIdAttributeContainers() {
         return mTaskIdAttributeContainer;
     }