2D Recents: Show shadows behind task views.

        int y = gridInfo.yOffsets[taskIndex];

        float z = stackLayout.mMaxTranslationZ;

        // We always set the dim alpha to 0, since we don't want grid task views to dim.

        float dimAlpha = 0f;

        float viewOutlineAlpha = 0f;

        // We always set the alpha of the view outline to 1, to make sure the shadow is visible.

        float viewOutlineAlpha = 1f;

        // We also need to invert the index in order to display the most recent tasks first.

        int taskLayoutIndex = taskCount - taskIndex - 1;

        boolean isTaskViewVisible = (taskLayoutIndex < MAX_LAYOUT_TASK_COUNT);