Transform animations should not collapse by default when interpolating

cc/animation/animation_curve.h

Index: cc/animation/animation_curve.h
diff --git a/cc/animation/animation_curve.h b/cc/animation/animation_curve.h
index 3b715048310bef25b5093d9874ef1caf9457f6ad..c021762e7b939e312660d8a8da5276e563542cc7 100644
--- a/cc/animation/animation_curve.h
+++ b/cc/animation/animation_curve.h
@@ -25,6 +25,7 @@ class FloatAnimationCurve;
 class ScrollOffsetAnimationCurve;
 class SizeAnimationCurve;
 class TransformAnimationCurve;
+class TransformOperations;
 
 // An animation curve is a function that returns a value given a time.
 class CC_ANIMATION_EXPORT AnimationCurve {
@@ -71,7 +72,7 @@ class CC_ANIMATION_EXPORT TransformAnimationCurve : public AnimationCurve {
  public:
   ~TransformAnimationCurve() override {}
 
-  virtual gfx::Transform GetValue(base::TimeDelta t) const = 0;
+  virtual TransformOperations GetValue(base::TimeDelta t) const = 0;
 
   // Sets |bounds| to be the bounding box for the region within which |box|
   // will move during this animation. If this region cannot be computed,