Add a top shadow to material design omnibox dropdown

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

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_LOCATION_BAR_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_LOCATION_BAR_VIEW_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 205 matching lines @@
   const OmniboxViewViews* omnibox_view() const { return omnibox_view_; }
 
   // Returns the height of the control without the top and bottom
   // edges(i.e.  the height of the edit control inside).  If
   // |use_preferred_size| is true this will be the preferred height,
   // otherwise it will be the current height.
   int GetInternalHeight(bool use_preferred_size);
 
   // Returns the position and width that the popup should be, and also the left
   // edge that the results should align themselves to (which will leave some
-  // border on the left of the popup).
+  // border on the left of the popup). |top_edge_overlap| specifies the number
+  // of pixels the top edge of the popup should overlap the bottom edge of
+  // the location bar.

[Peter Kasting, 2015/08/27 19:05:04]

I think you mean "toolbar" rather than "location bar" here.

[tdanderson, 2015/08/27 19:47:20]

Done.

   void GetOmniboxPopupPositioningInfo(gfx::Point* top_left_screen_coord,
                                       int* popup_width,
                                       int* left_margin,
-                                      int* right_margin);
+                                      int* right_margin,
+                                      int top_edge_overlap);
 
   // Updates the controller, and, if |contents| is non-null, restores saved
   // state that the tab holds.
   void Update(const content::WebContents* contents);
 
   // Clears the location bar's state for |contents|.
   void ResetTabState(content::WebContents* contents);
 
   // LocationBar:
   void FocusLocation(bool select_all) override;
@@ skipping 240 matching lines @@
   int dropdown_animation_offset_;
 
   // This is a debug state variable that stores if the WebContents was null
   // during the last RefreshPageAction.
   bool web_contents_null_at_last_refresh_;
 
   DISALLOW_COPY_AND_ASSIGN(LocationBarView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_LOCATION_BAR_VIEW_H_