Enable interpolation of CSS property font-variation-settings

third_party/WebKit/Source/core/animation/animatable/AnimatableFontVariationSettings.h

Index: third_party/WebKit/Source/core/animation/animatable/AnimatableFontVariationSettings.h
diff --git a/third_party/WebKit/Source/core/animation/animatable/AnimatableFontVariationSettings.h b/third_party/WebKit/Source/core/animation/animatable/AnimatableFontVariationSettings.h
new file mode 100644
index 0000000000000000000000000000000000000000..b0803f2a0e023135a6eab6de044ae539ac20330a
--- /dev/null
+++ b/third_party/WebKit/Source/core/animation/animatable/AnimatableFontVariationSettings.h
@@ -0,0 +1,37 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef AnimatableFontVariationSettings_h
+#define AnimatableFontVariationSettings_h
+
+#include "core/animation/animatable/AnimatableValue.h"
+
+#include "platform/fonts/opentype/FontSettings.h"
+
+namespace blink {
+
+class AnimatableFontVariationSettings final : public AnimatableValue {
+ public:
+  ~AnimatableFontVariationSettings() override {}
+  static PassRefPtr<AnimatableFontVariationSettings> Create(
+      PassRefPtr<FontVariationSettings> settings) {
+    return AdoptRef(new AnimatableFontVariationSettings(std::move(settings)));
+  }
+
+ private:
+  explicit AnimatableFontVariationSettings(
+      PassRefPtr<FontVariationSettings> settings)
+      : settings_(std::move(settings)) {}
+  AnimatableType GetType() const override { return kTypeFontVariationSettings; }
+  bool EqualTo(const AnimatableValue* other) const final;
+
+  const RefPtr<FontVariationSettings> settings_;
+};
+
+DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(AnimatableFontVariationSettings,
+                                   IsFontVariationSettings());
+
+}  // namespace blink
+
+#endif  // AnimatableFontVariationSettings_h