Take screenshot of finishing apps as requested

            for (int activityNdx = activities.size() - 1; activityNdx >= 0; --activityNdx) {

                final ActivityRecord r = activities.get(activityNdx);

                if (r.finishing) {

                    // Normally the screenshot will be taken in makeInvisible(). When an activity

                    // is finishing, we no longer change its visibility, but we still need to take

                    // the screenshots if startPausingLocked decided it should be taken.

                    if (r.mUpdateTaskThumbnailWhenHidden) {

                        r.updateThumbnailLocked(screenshotActivitiesLocked(r), null);

                        r.mUpdateTaskThumbnailWhenHidden = false;

                    }

                    continue;

                }

                final boolean isTop = r == top;