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

ui/views/background.cc

 // 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.
 
 #include "ui/views/background.h"
 
 #include "base/logging.h"
 #include "skia/ext/skia_utils_win.h"
 #include "third_party/skia/include/core/SkPaint.h"
 #include "ui/gfx/canvas.h"
@@ skipping 96 matching lines @@
                                                          SkColor color2) {
   Background* background = CreateBackgroundPainter(
       true, Painter::CreateVerticalGradient(color1, color2));
   background->SetNativeControlColor(
       color_utils::AlphaBlend(color1, color2, 128));
 
   return background;
 }
 
 //static
+Background* Background::CreateVerticalMultiColorGradientBackground(
+    SkColor* colors,
+    SkScalar* pos,
+    int count) {
+  Background* background = CreateBackgroundPainter(
+      true, Painter::CreateVerticalGradientRange(colors, pos, count));
+  background->SetNativeControlColor(
+      color_utils::AlphaBlend(colors[0], colors[count-1], 128));
+
+  return background;
+}
+
+//static
 Background* Background::CreateBackgroundPainter(bool owns_painter,
                                                 Painter* painter) {
   return new BackgroundPainter(owns_painter, painter);
 }
 
 }  // namespace views