ash:Shelf Update Alternate Layout

ash/system/tray/tray_constants.cc

 // 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.
 
 #include "ash/system/tray/tray_constants.h"
 
+#include "ash/ash_switches.h"
 #include "third_party/skia/include/core/SkColor.h"
 
 namespace ash {
 
 const int kPaddingFromRightEdgeOfScreenBottomAlignment = 7;
 const int kPaddingFromBottomOfScreenBottomAlignment = 7;
 const int kPaddingFromOuterEdgeOfLauncherVerticalAlignment = 8;
 const int kPaddingFromInnerEdgeOfLauncherVerticalAlignment = 9;
 const int kPaddingFromBottomOfScreenVerticalAlignment = 10;
 
@@ skipping 41 matching lines @@
 const SkColor kHeaderTextColorHover = SkColorSetARGB(0xd3, 0, 0, 0);
 
 const int kTrayPopupMinWidth = 300;
 const int kTrayPopupMaxWidth = 500;
 const int kNotificationIconWidth = 40;
 const int kNotificationButtonWidth = 32;
 const int kTrayNotificationContentsWidth = kTrayPopupMinWidth -
     (kNotificationIconWidth + kNotificationButtonWidth +
      (kTrayPopupPaddingHorizontal / 2) * 3);
 const int kTraySpacing = 8;
+const int kAlternateTraySpacing = 4;
+
+// Returns kTraySpacing or kAlternateTraySpacing as applicable
+// (Determined by ash::switches::UseAlternateShelfLayout).
+int GetTraySpacing() {
+  return ash::switches::UseAlternateShelfLayout() ?
+      kAlternateTraySpacing : kTraySpacing;
+}
 
 }  // namespace ash