CC Animation: Make cc/animation an independent GN component.

cc/trees/property_animation_state.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 CC_TREES_PROPERTY_ANIMATION_STATE_H_
 #define CC_TREES_PROPERTY_ANIMATION_STATE_H_
 
 #include "cc/base/cc_export.h"
 #include "cc/trees/target_property.h"
 
@@ skipping 12 matching lines @@
 
   PropertyAnimationState& operator|=(const PropertyAnimationState& other);
   PropertyAnimationState& operator^=(const PropertyAnimationState& other);
   PropertyAnimationState& operator&=(const PropertyAnimationState& other);
 
   bool IsValid() const;
 
   void Clear();
 };
 
-PropertyAnimationState operator^(const PropertyAnimationState& lhs,
-                                 const PropertyAnimationState& rhs);
+CC_EXPORT PropertyAnimationState operator^(const PropertyAnimationState& lhs,
+                                           const PropertyAnimationState& rhs);
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROPERTY_ANIMATION_STATE_H_