Fix layout of omnibox rows for material design

chrome/browser/ui/views/layout_constants.h

 // Copyright 2015 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_LAYOUT_CONSTANTS_H_
 #define CHROME_BROWSER_UI_VIEWS_LAYOUT_CONSTANTS_H_
 
 #include "ui/gfx/geometry/insets.h"
 
 enum LayoutConstant {
@@ skipping 72 matching lines @@
 
   // The horizontal space between most items in the toolbar.
   TOOLBAR_STANDARD_SPACING,
 };
 
 enum LayoutInset {
   // The padding between the avatar icon and the frame border on the left, the
   // tabstrip on the right, and the toolbar on the bottom.
   AVATAR_ICON,
 
+  // The padding above the top row and below the bottom row in the omnibox
+  // dropdown.
+  OMNIBOX_DROPDOWN,
+
   // In an omnibox dropdown row, the minimum distance between the icon and the
   // row edge.
   OMNIBOX_DROPDOWN_ICON,
 
   // In an omnibox dropdown row, the minimum distance between the text and the
   // row edge.
   OMNIBOX_DROPDOWN_TEXT,
 
   // The padding inside the tab bounds that defines the tab contents region.
   TAB,
 
   // The minimum padding of the toolbar.  The edge graphics have some built-in
   // spacing, shadowing, so this accounts for that as well.
   TOOLBAR,
 
   // The spacing between a ToolbarButton's image and its border.
   TOOLBAR_BUTTON,
 };
 
 int GetLayoutConstant(LayoutConstant constant);
 gfx::Insets GetLayoutInsets(LayoutInset inset);
 
 #endif  // CHROME_BROWSER_UI_VIEWS_LAYOUT_CONSTANTS_H_