Add ability to specify extra insets for a view via its border.

ui/views/border.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_BORDER_H_
 #define UI_VIEWS_BORDER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 55 matching lines @@
                                                    int right);
 
   // Creates a border of the specified color, and specified thickness on each
   // side.
   static std::unique_ptr<Border> CreateSolidSidedBorder(int top,
                                                         int left,
                                                         int bottom,
                                                         int right,
                                                         SkColor color);
 
+  // Creates a new border that draws |border| and adds additional padding. This
+  // is equivalent to changing the insets of |border| without changing how or
+  // what it paints. Example:
+  //
+  // view->SetBorder(Border::CreatePaddedBorder(
+  //                     Border::CreateSolidBorder(1, SK_ColorRED),
+  //                     gfx::Insets(2, 0, 0, 0)));
+  //
+  // yields a single dip red border and an additional 2dip of unpainted padding
+  // above the view content (below the border).
+  static std::unique_ptr<Border> CreatePaddedBorder(
+      std::unique_ptr<Border> border,
+      const gfx::Insets& insets);
+
   // Creates a Border from the specified Painter.
   // |insets| define size of an area allocated for a Border.
   static std::unique_ptr<Border> CreateBorderPainter(
       std::unique_ptr<Painter> painter,
       const gfx::Insets& insets);
 
   // Renders the border for the specified view.
   virtual void Paint(const View& view, gfx::Canvas* canvas) = 0;
 
   // Returns the border insets.
   virtual gfx::Insets GetInsets() const = 0;
 
   // Returns the minimum size this border requires.  Note that this may not be
   // the same as the insets.  For example, a Border may paint images to draw
   // some graphical border around a view, and this would return the minimum size
   // such that these images would not be clipped or overlapping -- but the
   // insets may be larger or smaller, depending on how the view wanted its
   // content laid out relative to these images.
   virtual gfx::Size GetMinimumSize() const = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Border);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_BORDER_H_