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

ui/views/controls/glow_hover_controller.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/controls/glow_hover_controller.h"
 
 #include "third_party/skia/include/effects/SkGradientShader.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/image/image_skia_operations.h"
@@ skipping 65 matching lines @@
   // Draw a radial gradient to hover_canvas.
   int radius = view_->width() / 3;
 
   SkPoint center_point;
   center_point.iset(location_.x(), location_.y());
   SkColor colors[2];
   int hover_alpha =
       static_cast<int>(255 * kOpacityScale * animation_.GetCurrentValue());
   colors[0] = SkColorSetARGB(hover_alpha, 255, 255, 255);
   colors[1] = SkColorSetARGB(0, 255, 255, 255);
-  SkShader* shader = SkGradientShader::CreateRadial(center_point,
+  skia::RefPtr<SkShader> shader = SkGradientShader::CreateRadial(center_point,
       SkIntToScalar(radius), colors, NULL, 2, SkShader::kClamp_TileMode);
   // Shader can end up null when radius = 0.
   // If so, this results in default full tab glow behavior.
   if (shader) {
     SkPaint paint;
     paint.setStyle(SkPaint::kFill_Style);
     paint.setAntiAlias(true);
-    paint.setShader(shader);
-    shader->unref();
+    paint.setShader(shader.get());
     hover_canvas.DrawRect(gfx::Rect(location_.x() - radius,
                                     location_.y() - radius,
                                     radius * 2, radius * 2), paint);
   }
   gfx::ImageSkia result = gfx::ImageSkiaOperations::CreateMaskedImage(
       gfx::ImageSkia(hover_canvas.ExtractImageRep()), mask_image);
   canvas->DrawImageInt(result, (view_->width() - mask_image.width()) / 2,
                        (view_->height() - mask_image.height()) / 2);
 }
 
 void GlowHoverController::AnimationEnded(const ui::Animation* animation) {
   view_->SchedulePaint();
 }
 
 void GlowHoverController::AnimationProgressed(const ui::Animation* animation) {
   view_->SchedulePaint();
 }
 
 }  // namespace views