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 d6479d6412b38dd0abc51670358899f68c255c56..057376d6e51695ca2bdac32fdb2917218160c3e8 100644
--- a/cc/test/fake_picture_pile_impl.h
+++ b/cc/test/fake_picture_pile_impl.h
@@ -27,10 +27,19 @@ class FakePicturePileImpl : public PicturePileImpl {
 
   void RemoveRecordingAt(int x, int y);
 
+  void AddPictureToRecording(
+      int x,
+      int y,
+      scoped_refptr<Picture> picture);
+
   void add_draw_rect(gfx::Rect rect) {
     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);
   }