Add skia::RefPtr class to wrap ref counted classes from Skia.

chrome/browser/ui/views/infobars/infobar_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 "chrome/browser/ui/views/infobars/infobar_background.h"
 
 #include "chrome/browser/ui/views/infobars/infobar_view.h"
 #include "third_party/skia/include/effects/SkGradientShader.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/color_utils.h"
 #include "ui/views/view.h"
 
 InfoBarBackground::InfoBarBackground(SkColor top, SkColor bottom)
     : separator_color_(SK_ColorBLACK), top_color_(top), bottom_color_(bottom) {
   SetNativeControlColor(
       color_utils::AlphaBlend(top_color_, bottom_color_, 128));
 }
 
 InfoBarBackground::~InfoBarBackground() {
 }
 
 void InfoBarBackground::Paint(gfx::Canvas* canvas, views::View* view) const {
   SkPoint gradient_points[2];
   gradient_points[0].iset(0, 0);
   gradient_points[1].iset(0, view->height());
   SkColor gradient_colors[2] = { top_color_, bottom_color_ };
-  SkShader* gradient_shader = SkGradientShader::CreateLinear(
+  skia::RefPtr<SkShader> gradient_shader = SkGradientShader::CreateLinear(
       gradient_points, gradient_colors, NULL, 2, SkShader::kClamp_TileMode);
   SkPaint paint;
   paint.setStrokeWidth(SkIntToScalar(InfoBar::kSeparatorLineHeight));
   paint.setStyle(SkPaint::kFill_Style);
   paint.setStrokeCap(SkPaint::kRound_Cap);
-  paint.setShader(gradient_shader);
-  gradient_shader->unref();
+  paint.setShader(gradient_shader.get());
 
   InfoBarView* infobar = static_cast<InfoBarView*>(view);
   SkCanvas* canvas_skia = canvas->sk_canvas();
   canvas_skia->drawPath(infobar->fill_path(), paint);
 
   paint.setShader(NULL);
   paint.setColor(SkColorSetA(separator_color_,
                              SkColorGetA(gradient_colors[0])));
   paint.setStyle(SkPaint::kStroke_Style);
   // Anti-alias the path so it doesn't look goofy when the edges are not at 45
   // degree angles, but don't anti-alias anything else, especially not the fill,
   // lest we get weird color bleeding problems.
   paint.setAntiAlias(true);
   canvas_skia->drawPath(infobar->stroke_path(), paint);
   paint.setAntiAlias(false);
 
   // Now draw the separator at the bottom.
   canvas->FillRect(gfx::Rect(0, view->height() - InfoBar::kSeparatorLineHeight,
                              view->width(), InfoBar::kSeparatorLineHeight),
                    separator_color_);
 }