Add a top shadow to material design omnibox dropdown

chrome/browser/ui/views/location_bar/location_bar_view.cc

Index: chrome/browser/ui/views/location_bar/location_bar_view.cc
diff --git a/chrome/browser/ui/views/location_bar/location_bar_view.cc b/chrome/browser/ui/views/location_bar/location_bar_view.cc
index 2d5fd1269c656e4c5bdc2f229d81f7408f2e86cf..5bcfe05151952bb1b0a7f2936ba900318fda6488 100644
--- a/chrome/browser/ui/views/location_bar/location_bar_view.cc
+++ b/chrome/browser/ui/views/location_bar/location_bar_view.cc
@@ -488,15 +488,15 @@ void LocationBarView::GetOmniboxPopupPositioningInfo(
     gfx::Point* top_left_screen_coord,
     int* popup_width,
     int* left_margin,
-    int* right_margin) {
+    int* right_margin,
+    int top_edge_overlap) {
   // Because the popup might appear atop the attached bookmark bar, there won't
   // necessarily be a client edge separating it from the rest of the toolbar.
   // Therefore we position the popup high enough so it can draw its own client
   // edge at the top, in the same place the toolbar would normally draw the
   // client edge.
-  *top_left_screen_coord = gfx::Point(
-      0,
-      parent()->height() - views::NonClientFrameView::kClientEdgeThickness);
+  *top_left_screen_coord = gfx::Point(0, parent()->height() - top_edge_overlap);
+
   views::View::ConvertPointToScreen(parent(), top_left_screen_coord);
   *popup_width = parent()->width();