Merge "Avoid NPE around mReusedTask of ActivityStarter"

                == (FLAG_ACTIVITY_NEW_TASK | FLAG_ACTIVITY_CLEAR_TASK)) {

            // The caller has requested to completely replace any existing task with its new

            // activity. Well that should not be too hard...

            intentActivity.task.performClearTaskLocked();

            intentActivity.task.setIntent(mStartActivity);

            mReuseTask = intentActivity.task;

            mReuseTask.performClearTaskLocked();

            mReuseTask.setIntent(mStartActivity);

            // When we clear the task - focus will be adjusted, which will bring another task

            // to top before we launch the activity we need. This will temporary swap their

            // mTaskToReturnTo values and we don't want to overwrite them accidentally.