Update from https://crrev.com/306655

cc/layers/content_layer_client.h

Index: cc/layers/content_layer_client.h
diff --git a/cc/layers/content_layer_client.h b/cc/layers/content_layer_client.h
index ea22e9798919ba4603fe2f8bdb4f69d082b561f7..c8d3a7e9873a5c1282dc0a3dda019f8191516979 100644
--- a/cc/layers/content_layer_client.h
+++ b/cc/layers/content_layer_client.h
@@ -6,6 +6,7 @@
 #define CC_LAYERS_CONTENT_LAYER_CLIENT_H_
 
 #include "cc/base/cc_export.h"
+#include "cc/resources/display_item_list.h"
 
 class SkCanvas;
 
@@ -27,6 +28,10 @@ class CC_EXPORT ContentLayerClient {
                              const gfx::Rect& clip,
                              GraphicsContextStatus gc_status) = 0;
 
+  virtual scoped_refptr<DisplayItemList> PaintContentsToDisplayList(
+      const gfx::Rect& clip,
+      GraphicsContextStatus gc_status) = 0;
+
   // If true the layer may skip clearing the background before rasterizing,
   // because it will cover any uncleared data with content.
   virtual bool FillsBoundsCompletely() const = 0;