CC Animation: Move PropertyAnimationState and TargetProperty to trees.

cc/animation/target_property.h

-// Copyright (c) 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 CC_ANIMATION_TARGET_PROPERTY_H_
-#define CC_ANIMATION_TARGET_PROPERTY_H_
-
-#include <bitset>
-
-namespace cc {
-
-namespace TargetProperty {
-
-enum Type {
-  TRANSFORM = 0,
-  OPACITY,
-  FILTER,
-  SCROLL_OFFSET,
-  BACKGROUND_COLOR,
-  // These sentinels must be last
-  FIRST_TARGET_PROPERTY = TRANSFORM,
-  LAST_TARGET_PROPERTY = BACKGROUND_COLOR
-};
-
-const char* GetName(TargetProperty::Type property);
-
-}  // namespace TargetProperty
-
-// A set of target properties. TargetProperty must be 0-based enum.
-using TargetProperties = std::bitset<TargetProperty::LAST_TARGET_PROPERTY + 1>;
-
-}  // namespace cc
-
-#endif  // CC_ANIMATION_TARGET_PROPERTY_H_