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

chrome/browser/ui/views/tabs/tab.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/tabs/tab.h"
 
 #include <limits>
 
 #include "base/command_line.h"
 #include "base/debug/alias.h"
@@ skipping 1082 matching lines @@
     x = mini_title_animation_->CurrentValueBetween(x0, x1);
   } else if (mini_title_animation_->current_part_index() == 1) {
     x = x1;
   } else {
     x = mini_title_animation_->CurrentValueBetween(x1, x2);
   }
   SkPoint center_point;
   center_point.iset(x, 0);
   SkColor colors[2] = { kMiniTitleChangeGradientColor1,
                         kMiniTitleChangeGradientColor2 };
-  SkShader* shader = SkGradientShader::CreateRadial(center_point,
+  skia::RefPtr<SkShader> shader = SkGradientShader::CreateRadial(center_point,
       SkIntToScalar(radius), colors, NULL, 2, SkShader::kClamp_TileMode);
   SkPaint paint;
-  paint.setShader(shader);
-  shader->unref();
+  paint.setShader(shader.get());
   hover_canvas.DrawRect(gfx::Rect(x - radius, -radius, radius * 2, radius * 2),
                         paint);
 
   // Draw the radial gradient clipped to the background into hover_image.
   gfx::ImageSkia hover_image = gfx::ImageSkiaOperations::CreateMaskedImage(
       gfx::ImageSkia(hover_canvas.ExtractImageRep()), background_image);
 
   // Draw the tab background to the canvas.
   canvas->DrawImageInt(background_image, 0, 0);
 
@@ skipping 447 matching lines @@
                          const gfx::ImageSkia& image) {
   DCHECK_NE(scale_factor, ui::SCALE_FACTOR_NONE);
   ImageCacheEntry entry;
   entry.resource_id = resource_id;
   entry.scale_factor = scale_factor;
   entry.image = image;
   image_cache_->push_front(entry);
   if (image_cache_->size() > kMaxImageCacheSize)
     image_cache_->pop_back();
 }