Update from https://crrev.com/320343

cc/resources/display_item_list.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 CC_RESOURCES_DISPLAY_ITEM_LIST_H_
 #define CC_RESOURCES_DISPLAY_ITEM_LIST_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/base/cc_export.h"
 #include "cc/base/scoped_ptr_vector.h"
 #include "cc/resources/display_item.h"
+#include "skia/ext/refptr.h"
+#include "third_party/skia/include/core/SkPicture.h"
 #include "ui/gfx/geometry/rect.h"
 
 class SkCanvas;
 class SkDrawPictureCallback;
 
 namespace cc {
 
 class CC_EXPORT DisplayItemList
     : public base::RefCountedThreadSafe<DisplayItemList> {
  public:
   static scoped_refptr<DisplayItemList> Create();
 
   void Raster(SkCanvas* canvas,
               SkDrawPictureCallback* callback,
               float contents_scale) const;
 
   void AppendItem(scoped_ptr<DisplayItem> item);
 
   void set_layer_rect(gfx::Rect layer_rect) { layer_rect_ = layer_rect; }
   gfx::Rect layer_rect() const { return layer_rect_; }
 
+  void CreateAndCacheSkPicture();
+
   bool IsSuitableForGpuRasterization() const;
   int ApproximateOpCount() const;
   size_t PictureMemoryUsage() const;
 
   scoped_refptr<base::trace_event::ConvertableToTraceFormat> AsValue() const;
 
   void EmitTraceSnapshot() const;
 
  private:
   DisplayItemList();
   ~DisplayItemList();
   ScopedPtrVector<DisplayItem> items_;
+  skia::RefPtr<SkPicture> picture_;
+
   gfx::Rect layer_rect_;
   bool is_suitable_for_gpu_rasterization_;
   int approximate_op_count_;
 
   friend class base::RefCountedThreadSafe<DisplayItemList>;
   DISALLOW_COPY_AND_ASSIGN(DisplayItemList);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_DISPLAY_ITEM_LIST_H_