Add API to get multiple running tasks for split

public class ActivityManagerWrapper {

    private static final String TAG = "ActivityManagerWrapper";

    private static final int NUM_RECENT_ACTIVITIES_REQUEST = 3;

    private static final ActivityManagerWrapper sInstance = new ActivityManagerWrapper();

    // Should match the values in PhoneWindowManager

        return tasks.get(0);

    }

    /**

     * We ask for {@link #NUM_RECENT_ACTIVITIES_REQUEST} activities because when in split screen,

     * we'll get back 2 activities for each split app and one for launcher. Launcher might be more

     * "recently" used than one of the split apps so if we only request 2 tasks, then we might miss

     * out on one of the split apps

     *

     * @return an array of up to {@link #NUM_RECENT_ACTIVITIES_REQUEST} running tasks

     *         filtering only for tasks that can be visible in the recent tasks list.

     */

    public ActivityManager.RunningTaskInfo[] getRunningTasks(boolean filterOnlyVisibleRecents) {

        // Note: The set of running tasks from the system is ordered by recency

        List<ActivityManager.RunningTaskInfo> tasks =

                mAtm.getTasks(NUM_RECENT_ACTIVITIES_REQUEST, filterOnlyVisibleRecents);

        return tasks.toArray(new RunningTaskInfo[tasks.size()]);

    }

    /**

     * @return a list of the recents tasks.

     */