[ash-md] Updates ash shelf tooltips to MD

ash/common/shelf/shelf_constants.h

Index: ash/common/shelf/shelf_constants.h
diff --git a/ash/common/shelf/shelf_constants.h b/ash/common/shelf/shelf_constants.h
index 1e8c97e0196a7096301e845ee752cfd2d0c76c72..5173f7109871d0d574c113809ac6d72ce36f1e06 100644
--- a/ash/common/shelf/shelf_constants.h
+++ b/ash/common/shelf/shelf_constants.h
@@ -25,7 +25,25 @@ enum ShelfConstant {
   SHELF_BUTTON_SIZE,
 
   // Insets allocated for shelf when it is auto hidden.
-  SHELF_INSETS_FOR_AUTO_HIDE
+  SHELF_INSETS_FOR_AUTO_HIDE,
+
+  // Shelf item tooltip height.
+  TOOLTIP_HEIGHT,
+
+  // The maximum width of the tooltip bubble.  The value matches that from
+  // ash/tooltip/tooltip_controller.cc
+  TOOLTIP_MAX_WIDTH,
+
+  // Shelf item tooltip internal text margins.
+  TOOLTIP_TOP_BOTTOM_MARGIN,
+  TOOLTIP_LEFT_RIGHT_MARGIN,
+
+  // The offset for the tooltip bubble - making sure that the bubble is flush
+  // with the shelf (non-MD) or spaced with a fixed gap (MD). The offset
+  // includes the arrow size in pixels as well as the activation bar and other
+  // spacing elements.
+  TOOLTIP_ARROW_TOP_BOTTOM_OFFSET,
+  TOOLTIP_ARROW_LEFT_RIGHT_OFFSET,
 };
 
 // Invalid image resource id used for ShelfItemDetails.