Update from https://crrev.com/306655

cc/test/skia_common.cc

Index: cc/test/skia_common.cc
diff --git a/cc/test/skia_common.cc b/cc/test/skia_common.cc
index 1ccb2d1add07c5ca321f943b4a0496cc3ff40249..ef61e217fc52adfc5468750230087a4d11a2e78f 100644
--- a/cc/test/skia_common.cc
+++ b/cc/test/skia_common.cc
@@ -4,6 +4,7 @@
 
 #include "cc/test/skia_common.h"
 
+#include "cc/resources/display_item_list.h"
 #include "cc/resources/picture.h"
 #include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkCanvas.h"
@@ -26,6 +27,18 @@ void DrawPicture(unsigned char* buffer,
   picture->Raster(&canvas, NULL, negated_content_region, 1.0f);
 }
 
+void DrawDisplayList(unsigned char* buffer,
+                     const gfx::Rect& layer_rect,
+                     scoped_refptr<DisplayItemList> list) {
+  SkImageInfo info =
+      SkImageInfo::MakeN32Premul(layer_rect.width(), layer_rect.height());
+  SkBitmap bitmap;
+  bitmap.installPixels(info, buffer, info.minRowBytes());
+  SkCanvas canvas(bitmap);
+  canvas.clipRect(gfx::RectToSkRect(layer_rect));
+  list->Raster(&canvas, NULL, 1.0f);
+}
+
 void CreateBitmap(const gfx::Size& size, const char* uri, SkBitmap* bitmap) {
   SkImageInfo info = SkImageInfo::MakeN32Premul(size.width(), size.height());