(Views only) Add a gradient background to the tabstrip of the view tabbed pane implementation.

ui/views/painter.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_PAINTER_H_
 #define UI_VIEWS_PAINTER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "third_party/skia/include/core/SkColor.h"
@@ skipping 17 matching lines @@
   // A convenience method for painting a Painter in a particular region.
   // This translates the canvas to x/y and paints the painter.
   static void PaintPainterAt(gfx::Canvas* canvas,
                              Painter* painter,
                              const gfx::Rect& rect);
 
   // Creates a painter that draws a gradient between the two colors.
   static Painter* CreateHorizontalGradient(SkColor c1, SkColor c2);
   static Painter* CreateVerticalGradient(SkColor c1, SkColor c2);
 
+  // Creates a painter that draws a multi-color gradient. |colors| contains the
+  // gradient colors and |pos| the relative positions of the colors. The first
+  // element in |pos| must be 0.0 and the last element 1.0. |count| contains
+  // the number of elements in |colors| and |pos|.
+  static Painter* CreateVerticalMultiColorGradient(SkColor* colors,
+                                                   SkScalar* pos,
+                                                   size_t count);
+
   // Creates a painter that divides |image| into nine regions. The four corners
   // are rendered at the size specified in insets (for example, the upper
   // left corners is rendered at 0x0 with a size of
   // insets.left()xinsets.right()). The four edges are stretched to fill the
   // destination size.
   // Ownership is passed to the caller.
   static Painter* CreateImagePainter(const gfx::ImageSkia& image,
                                      const gfx::Insets& insets,
                                      bool paint_center);
 
@@ skipping 33 matching lines @@
   int height_;
   // NOTE: the images are owned by ResourceBundle. Don't free them.
   const gfx::ImageSkia* images_[3];
 
   DISALLOW_COPY_AND_ASSIGN(HorizontalPainter);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_PAINTER_H_