cc: Do GatherPixelRefs from skia at record time

cc/test/fake_picture_pile_impl.h

Index: cc/test/fake_picture_pile_impl.h
diff --git a/cc/test/fake_picture_pile_impl.h b/cc/test/fake_picture_pile_impl.h
index f3bde7bcc4d649120d1e86ff87f47ff3bc509b8d..43459a4ff5bdd382eca8cc24f6fadc1b9378984e 100644
--- a/cc/test/fake_picture_pile_impl.h
+++ b/cc/test/fake_picture_pile_impl.h
@@ -31,6 +31,10 @@ class FakePicturePileImpl : public PicturePileImpl {
     client_.add_draw_rect(rect, default_paint_);
   }
 
+  void add_draw_bitmap(const SkBitmap& bitmap, gfx::Point point) {
+    client_.add_draw_bitmap(bitmap, point);
+  }
+
   void add_draw_rect_with_paint(gfx::Rect rect, const SkPaint& paint) {
     client_.add_draw_rect(rect, paint);
   }