Native Themes: Add table header colors

ui/views/background.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_BACKGROUND_H_
 #define UI_VIEWS_BACKGROUND_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 39 matching lines @@
   // Creates a background that fills the canvas in the specified color.
   static Background* CreateSolidBackground(int r, int g, int b) {
     return CreateSolidBackground(SkColorSetRGB(r, g, b));
   }
 
   // Creates a background that fills the canvas in the specified color.
   static Background* CreateSolidBackground(int r, int g, int b, int a) {
     return CreateSolidBackground(SkColorSetARGB(a, r, g, b));
   }
 
-  // Creates a background that contains a vertical gradient that varies
-  // from |color1| to |color2|
-  static Background* CreateVerticalGradientBackground(SkColor color1,
-                                                      SkColor color2);
-
   // Creates Chrome's standard panel background
   static Background* CreateStandardPanelBackground();
 
   // Creates a Background from the specified Painter.
   static Background* CreateBackgroundPainter(std::unique_ptr<Painter> painter);
 
   // Render the background for the provided view
   virtual void Paint(gfx::Canvas* canvas, View* view) const = 0;
 
   // Set a solid, opaque color to be used when drawing backgrounds of native
   // controls.  Unfortunately alpha=0 is not an option.
   void SetNativeControlColor(SkColor color);
 
   // Returns the "background color".  This is equivalent to the color set in
   // SetNativeControlColor().  For solid backgrounds, this is the color; for
   // gradient backgrounds, it's the midpoint of the gradient; for painter
   // backgrounds, this is not useful (returns a default color).
   SkColor get_color() const { return color_; }
 
  private:
   SkColor color_;
 
   DISALLOW_COPY_AND_ASSIGN(Background);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_BACKGROUND_H_