cc: Move SkShader construction to a single spot in PaintShader

third_party/WebKit/Source/platform/graphics/ImagePattern.h

 // Copyright 2014 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.
 
 #ifndef ImagePattern_h
 #define ImagePattern_h
 
 #include "platform/graphics/Pattern.h"
 
 class SkImage;
 
 namespace blink {
 
 class Image;
 
 class PLATFORM_EXPORT ImagePattern final : public Pattern {
  public:
   static PassRefPtr<ImagePattern> Create(PassRefPtr<Image>, RepeatMode);
 
   bool IsTextureBacked() const override;
 
  protected:
-  sk_sp<PaintShader> CreateShader(const SkMatrix&) override;
+  std::unique_ptr<PaintShader> CreateShader(const SkMatrix&) override;
   bool IsLocalMatrixChanged(const SkMatrix&) const override;
 
  private:
   ImagePattern(PassRefPtr<Image>, RepeatMode);
   SkMatrix previous_local_matrix_;
 
   sk_sp<SkImage> tile_image_;
 };
 
 }  // namespace blink
 
 #endif /* ImagePattern_h */