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

ui/views/layout/box_layout.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 UI_VIEWS_LAYOUT_BOX_LAYOUT_H_
 #define UI_VIEWS_LAYOUT_BOX_LAYOUT_H_
 
 #include <map>
 
 #include "base/compiler_specific.h"
@@ skipping 79 matching lines @@
   // negative.
   void SetFlexForView(const View* view, int flex);
 
   // Clears the flex for the given |view|, causing it to use the default
   // flex.
   void ClearFlexForView(const View* view);
 
   // Sets the flex for views to use when none is specified.
   void SetDefaultFlex(int default_flex);
 
+  // Positions individual child.
+  void LayoutChild(View* child,
+                   const gfx::Rect& child_area,
+                   int main_free_space,
+                   int flex_sum,
+                   int* main_position,
+                   int* current_flex,
+                   int* total_padding);
+
+  // Positions all children. Can be overridden to change the visible order.
+  virtual void LayoutChildren(View* host,
+                              const gfx::Rect& child_area,
+                              int main_free_space,
+                              int flex_sum,
+                              int main_position,
+                              int current_flex,
+                              int* total_padding);
+
   // Overridden from views::LayoutManager:
   void Installed(View* host) override;
   void ViewRemoved(View* host, View* view) override;
   void Layout(View* host) override;
   gfx::Size GetPreferredSize(const View* host) const override;
   int GetPreferredHeightForWidth(const View* host, int width) const override;
 
  private:
   // Returns the flex for the specified |view|.
   int GetFlexForView(const View* view) const;
@@ skipping 56 matching lines @@
 
   // The view that this BoxLayout is managing the layout for.
   views::View* host_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(BoxLayout);
 };
 
 } // namespace views
 
 #endif  // UI_VIEWS_LAYOUT_BOX_LAYOUT_H_