Update from https://crrev.com/306655

cc/test/skia_common.h

Index: cc/test/skia_common.h
diff --git a/cc/test/skia_common.h b/cc/test/skia_common.h
index 3bafa0b8f99209d34ffb6ee3da2fea67df097a0a..51ebcc5cbbb718125ac1c800f0b55776ff93e733 100644
--- a/cc/test/skia_common.h
+++ b/cc/test/skia_common.h
@@ -18,11 +18,16 @@ class Size;
 
 namespace cc {
 class Picture;
+class DisplayItemList;
 
 void DrawPicture(unsigned char* buffer,
                  const gfx::Rect& layer_rect,
                  scoped_refptr<Picture> picture);
 
+void DrawDisplayList(unsigned char* buffer,
+                     const gfx::Rect& layer_rect,
+                     scoped_refptr<DisplayItemList> list);
+
 void CreateBitmap(const gfx::Size& size, const char* uri, SkBitmap* bitmap);
 
 }  // namespace cc