[ash-md] Makes Wi-Fi header row sticky when network list is scrolled

ash/common/system/tray/tray_constants.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 ASH_COMMON_SYSTEM_TRAY_TRAY_CONSTANTS_H_
 #define ASH_COMMON_SYSTEM_TRAY_TRAY_CONSTANTS_H_
 
 #include "ash/ash_export.h"
 
 typedef unsigned int SkColor;
@@ skipping 66 matching lines @@
 
 // Color and width of a line used to separate tray items in the shelf.
 extern const SkColor kSeparatorColor;
 extern const int kSeparatorWidth;
 
 // The color and height of the horizontal separator used in the material design
 // system menu (i.e., the vertical line used to separate elements horizontally).
 extern const SkColor kHorizontalSeparatorColor;
 extern const int kHorizontalSeparatorHeight;
 
+// View ID that is used to mark sticky header rows in a scroll view.
+extern const int kHeaderRowId;
+
 // The size and foreground color of the icons appearing in the material design
 // system tray.
 extern const int kTrayIconSize;
 extern const SkColor kTrayIconColor;
 
 // The size and foreground color of the icons appearing in the material design
 // system menu.
 extern const int kMenuIconSize;
 extern const SkColor kMenuIconColor;
 extern const SkColor kMenuIconColorDisabled;
@@ skipping 60 matching lines @@
 int GetTrayConstant(TrayConstant constant);
 
 namespace test {
 const int kSettingsTrayItemViewId = 10000;
 const int kAccessibilityTrayItemViewId = 10001;
 }  // namespace test
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_TRAY_CONSTANTS_H_