1 files changed, 51 insertions, 0 deletions
diff --git a/dom/grid/GridTracks.h b/dom/grid/GridTracks.h
new file mode 100644
index 0000000000..d20da5e12b
--- /dev/null
+++ b/dom/grid/GridTracks.h
@@ -0,0 +1,51 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_GridTracks_h
+#define mozilla_dom_GridTracks_h
+
+#include "nsTArray.h"
+#include "nsWrapperCache.h"
+
+namespace mozilla {
+
+struct ComputedGridTrackInfo;
+
+namespace dom {
+
+class GridDimension;
+class GridTrack;
+
+class GridTracks : public nsISupports, public nsWrapperCache {
+ public:
+  explicit GridTracks(GridDimension* aParent);
+
+ protected:
+  virtual ~GridTracks();
+
+ public:
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(GridTracks)
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+  GridDimension* GetParentObject() { return mParent; }
+
+  uint32_t Length() const;
+  GridTrack* Item(uint32_t aIndex);
+  GridTrack* IndexedGetter(uint32_t aIndex, bool& aFound);
+
+  void SetTrackInfo(const mozilla::ComputedGridTrackInfo* aTrackInfo);
+
+ protected:
+  RefPtr<GridDimension> mParent;
+  nsTArray<RefPtr<GridTrack>> mTracks;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif /* mozilla_dom_GridTracks_h */