Get the view to be used as qsb bar from the launcher directly.

This will allow more control over the qsb visuals and behaviour in GEL.
Depends on ag/339203

Future changes:
- revert ag/344333 since we won't need the normal qsb to support hotword
  anymore
- Dragging icons over the Drop target bar (to remove/uninstall them or
  get App info) doesn't currently work in GEL. There might be future
  changes needed to fix that.

Change-Id: Ic498f0abee5ad99ef1644ff94f174b61f8e1f5f0

src/com/android/launcher3/DrawableStateProxyView.java

@@ -58,8 +58,10 @@ public class DrawableStateProxyView extends LinearLayout {
             View parent = (View) getParent();
             mView = parent.findViewById(mViewId);
         }
-        mView.setPressed(isPressed());
-        mView.setHovered(isHovered());
+        if (mView != null) {
+            mView.setPressed(isPressed());
+            mView.setHovered(isHovered());
+        }
     }
 
     @Override