Raster into an SkP before rendering a DisplayList.

cc/resources/display_item_list.h

Index: cc/resources/display_item_list.h
diff --git a/cc/resources/display_item_list.h b/cc/resources/display_item_list.h
index e16b8b8b997641afbb62c33b13fa2385ebc541ed..39694d72a1dba7ed8d5ecd444bc597a50941a5b4 100644
--- a/cc/resources/display_item_list.h
+++ b/cc/resources/display_item_list.h
@@ -11,6 +11,8 @@
 #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;
@@ -32,6 +34,8 @@ class CC_EXPORT DisplayItemList
   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;
@@ -44,6 +48,8 @@ class CC_EXPORT DisplayItemList
   DisplayItemList();
   ~DisplayItemList();
   ScopedPtrVector<DisplayItem> items_;
+  skia::RefPtr<SkPicture> picture_;
+
   gfx::Rect layer_rect_;
   bool is_suitable_for_gpu_rasterization_;
   int approximate_op_count_;