mash: Migrate ShelfTooltipManager to wm common types.

ash/shelf/shelf_view.h

Index: ash/shelf/shelf_view.h
diff --git a/ash/shelf/shelf_view.h b/ash/shelf/shelf_view.h
index 0bbc33470c88040b827d5d3158aa884e1e42ed92..ffc980639253d5e7ca40b3d79ab18e4a986261f9 100644
--- a/ash/shelf/shelf_view.h
+++ b/ash/shelf/shelf_view.h
@@ -75,6 +75,7 @@ class ASH_EXPORT ShelfView : public views::View,
   ~ShelfView() override;
 
   Shelf* shelf() const { return shelf_; }
+  WmShelf* wm_shelf() const { return wm_shelf_; }

[James Cook, 2016/07/22 23:48:21]

optional: This is OK, but what do you think of passing WmShelf into the
ShelfTooltipManager constructor instead? I've been trying to dependency-inject
things in the shelf code because I think it makes it a little more obvious about
what needs to be constructed before what else. I don't feel strongly, though.

[msw, 2016/07/25 22:56:44]

The WmShelf is injected into ShelfView via ctor, seems okay to use that value
from an 'internal' object owned by ShelfView (like tooltip manager), but I don't
feel too strongly, and would gladly change it.

   ShelfModel* model() const { return model_; }
 
   void Init();