Transform animations should not collapse by default when interpolating

cc/test/animation_timelines_test_common.h

 // Copyright 2015 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_TEST_ANIMATION_TIMELINES_TEST_COMMON_H_
 #define CC_TEST_ANIMATION_TIMELINES_TEST_COMMON_H_
 
 #include <memory>
 #include <unordered_map>
 
 #include "cc/animation/animation.h"
 #include "cc/animation/animation_delegate.h"
 #include "cc/animation/animation_host.h"
 #include "cc/trees/mutator_host_client.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/geometry/scroll_offset.h"
+#include "ui/gfx/transform.h"
 
 namespace cc {
 
 class TestLayer {
  public:
   static std::unique_ptr<TestLayer> Create();
   ~TestLayer();
 
   void ClearMutatedProperties();
 
@@ skipping 247 matching lines @@
   scoped_refptr<ElementAnimations> element_animations_;
 
   scoped_refptr<AnimationTimeline> timeline_impl_;
   scoped_refptr<AnimationPlayer> player_impl_;
   scoped_refptr<ElementAnimations> element_animations_impl_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_ANIMATION_TIMELINES_TEST_COMMON_H_