import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

layout/style/LayerAnimationInfo.h

@@ -0,0 +1,33 @@
+/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
+/* 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_LayerAnimationInfo_h
+#define mozilla_LayerAnimationInfo_h
+
+#include "nsChangeHint.h"
+#include "nsCSSPropertyID.h"
+#include "nsDisplayList.h" // For nsDisplayItem::Type
+
+namespace mozilla {
+
+struct LayerAnimationInfo {
+#ifdef DEBUG
+  static void Initialize();
+#endif
+  // For CSS properties that may be animated on a separate layer, represents
+  // a record of the corresponding layer type and change hint.
+  struct Record {
+    nsCSSPropertyID mProperty;
+    nsDisplayItem::Type mLayerType;
+    nsChangeHint mChangeHint;
+  };
+
+  static const size_t kRecords = 2;
+  static const Record sRecords[kRecords];
+};
+
+} // namespace mozilla
+
+#endif /* !defined(mozilla_LayerAnimationInfo_h) */