Update from chromium https://crrev.com/301725/

cc/resources/picture_pile.h

 // Copyright 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.
 
 #ifndef CC_RESOURCES_PICTURE_PILE_H_
 #define CC_RESOURCES_PICTURE_PILE_H_
 
+#include "base/memory/ref_counted.h"
 #include "cc/resources/picture_pile_base.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace cc {
 class PicturePileImpl;
 class Region;
 class RenderingStatsInstrumentation;
 
 class CC_EXPORT PicturePile : public PicturePileBase {
  public:
   PicturePile();
+  ~PicturePile() override;
 
   // Re-record parts of the picture that are invalid.
   // Invalidations are in layer space, and will be expanded to cover everything
   // that was either recorded/changed or that has no recording, leaving out only
   // pieces that we had a recording for and it was not changed.
   // Return true iff the pile was modified.
   bool UpdateAndExpandInvalidation(
       ContentLayerClient* painter,
       Region* invalidation,
       SkColor background_color,
@@ skipping 17 matching lines @@
 
   bool is_suitable_for_gpu_rasterization() const {
     return is_suitable_for_gpu_rasterization_;
   }
   void SetUnsuitableForGpuRasterizationForTesting() {
     is_suitable_for_gpu_rasterization_ = false;
   }
 
   void SetPixelRecordDistanceForTesting(int d) { pixel_record_distance_ = d; }
 
- protected:
-  ~PicturePile() override;
-
  private:
   friend class PicturePileImpl;
 
   void DetermineIfSolidColor();
 
   bool is_suitable_for_gpu_rasterization_;
   int pixel_record_distance_;
 
   DISALLOW_COPY_AND_ASSIGN(PicturePile);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_PICTURE_PILE_H_