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/DynamicGrid.java

@@ -321,7 +321,7 @@ class DeviceProfile {
         searchBarSpace.setLayoutParams(lp);
 
         // Layout the search bar
-        View searchBar = searchBarSpace.findViewById(R.id.qsb_search_bar);
+        View searchBar = launcher.getQsbBar();
         lp = (FrameLayout.LayoutParams) searchBar.getLayoutParams();
         lp.width = LayoutParams.MATCH_PARENT;
         lp.height = LayoutParams.MATCH_PARENT;