Add VR Shell animation classes and unit test.

chrome/browser/android/vr_shell/animation.h

+// Copyright 2016 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 CHROME_BROWSER_ANDROID_VR_SHELL_ANIMATION_H_
+#define CHROME_BROWSER_ANDROID_VR_SHELL_ANIMATION_H_
+
+#include <memory>
+#include <vector>
+
+#include "chrome/browser/android/vr_shell/easing.h"
+
+namespace vr_shell {
+
+class Animation {
+ public:
+  enum Property {
+    COPYRECT = 0,
+    SIZE,
+    TRANSLATION,
+    UNUSED, // Available for a future type.

[mthiesse, 2016/09/12 14:18:27]

Add a comment for why this strangeness is here?

[cjgrant, 2016/09/13 17:32:15]

Done.  It'll be SCALE in a follow-on change.

+    ROTATION,
+  };
+
+  Animation(int id,
+            Property property,
+            std::unique_ptr<Easing> easing,
+            std::vector<float> from,
+            std::vector<float> to,
+            int64_t start,
+            int64_t duration);
+  ~Animation();
+
+  int id;
+  Property property;
+  std::unique_ptr<Easing> easing;
+  std::vector<float> from;
+  std::vector<float> to;
+  int64_t start;
+  int64_t duration;
+};
+
+}  // namespace vr_shell
+
+#endif  // CHROME_BROWSER_ANDROID_VR_SHELL_ANIMATION_H_