Adapted HUN behavior when swiping vertically

It's not dismissed anymore but pushed into the shade
when swiping up.
Also, when swiping down, we now dimiss the HUN.

Bug: 15594813
Change-Id: I0b6a761bebbe281e31bf3b1e20704e2e5da07861

packages/SystemUI/src/com/android/systemui/statusbar/policy/HeadsUpNotificationView.java

@@ -397,14 +397,11 @@ public class HeadsUpNotificationView extends FrameLayout implements SwipeHelper.
                     final float daX = Math.abs(ev.getX() - mFirstX);
                     final float daY = Math.abs(dY);
                     if (!mConsuming && daX < daY && daY > mTouchSlop) {
+                        releaseAndClose();
                         if (dY > 0) {
                             if (DEBUG_EDGE_SWIPE) Log.d(TAG, "found an open");
                             mBar.animateExpandNotificationsPanel();
                         }
-                        if (dY < 0) {
-                            if (DEBUG_EDGE_SWIPE) Log.d(TAG, "found a close");
-                            mBar.onHeadsUpDismissed();
-                        }
                         mConsuming = true;
                     }
                     break;