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

chrome/browser/ui/views/tabs/dragged_tab_view.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/dragged_tab_view.h"
 
 #include "base/stl_util.h"
 #include "chrome/browser/ui/views/tabs/native_view_photobooth.h"
 #include "third_party/skia/include/core/SkShader.h"
 #include "ui/gfx/canvas.h"
@@ skipping 137 matching lines @@
                        ps.width() - kTwiceDragFrameBorderSize,
                        contents_size_.height());
   scale_canvas.FillRect(image_rect, SK_ColorBLACK);
   photobooth_->PaintScreenshotIntoCanvas(&scale_canvas, image_rect);
   for (size_t i = 0; i < renderers_.size(); ++i)
     renderers_[i]->Paint(&scale_canvas);
 
   SkBitmap mipmap = scale_canvas.ExtractImageRep().sk_bitmap();
   mipmap.buildMipMap(true);
 
-  SkShader* bitmap_shader =
+  skia::RefPtr<SkShader> bitmap_shader =
       SkShader::CreateBitmapShader(mipmap, SkShader::kClamp_TileMode,
                                    SkShader::kClamp_TileMode);
 
   SkMatrix shader_scale;
   shader_scale.setScale(kScalingFactor, kScalingFactor);
   bitmap_shader->setLocalMatrix(shader_scale);
 
   SkPaint paint;
-  paint.setShader(bitmap_shader);
+  paint.setShader(bitmap_shader.get());
   paint.setAntiAlias(true);
-  bitmap_shader->unref();
 
   canvas->DrawRect(gfx::Rect(ps), paint);
 }
 
 void DraggedTabView::PaintFocusRect(gfx::Canvas* canvas) {
   gfx::Size ps = GetPreferredSize();
   canvas->DrawFocusRect(
       gfx::Rect(0, 0,
                 static_cast<int>(ps.width() * kScalingFactor),
                 static_cast<int>(ps.height() * kScalingFactor)));
 }
 
 gfx::Size DraggedTabView::PreferredContainerSize() {
   gfx::Size ps = GetPreferredSize();
   return gfx::Size(ScaleValue(ps.width()), ScaleValue(ps.height()));
 }
 
 int DraggedTabView::ScaleValue(int value) {
   return static_cast<int>(value * kScalingFactor);
 }