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

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 "build/build_config.h"
 
 #if defined(OS_WIN)
@@ skipping 41 matching lines @@
   // 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 a background that contains a vertical gradient. The gradient can
+  // have multiple |colors|. The |pos| array contains the relative positions of
+  // each corresponding color. |colors| and |pos| must be the same size. The
+  // first element in |pos| must be 0.0 and the last element must be 1.0.
+  // |count| contains the number of elements in |colors| and |pos|.
+  static Background* CreateVerticalMultiColorGradientBackground(SkColor* colors,
+                                                                SkScalar* pos,
+                                                                size_t count);
+
   // Creates Chrome's standard panel background
   static Background* CreateStandardPanelBackground();
 
   // Creates a Background from the specified Painter. If owns_painter is
   // true, the Painter is deleted when the Border is deleted.
   static Background* CreateBackgroundPainter(bool owns_painter,
                                              Painter* painter);
 
   // Render the background for the provided view
   virtual void Paint(gfx::Canvas* canvas, View* view) const = 0;
@@ skipping 21 matching lines @@
   // TODO(port): Create portable replacement for HBRUSH.
   mutable HBRUSH native_control_brush_;
 #endif  // defined(OS_WIN)
 
   DISALLOW_COPY_AND_ASSIGN(Background);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_BACKGROUND_H_