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 72b8e6309148ccfaf5390d408ee1905dbc56b769..1b78222816167dc1d8323c58c47d3c81b63dd397 100644
--- a/cc/animation/animation_curve.h
+++ b/cc/animation/animation_curve.h
@@ -23,6 +23,7 @@ class FilterAnimationCurve;
 class FloatAnimationCurve;
 class ScrollOffsetAnimationCurve;
 class TransformAnimationCurve;
+class TransformOperations;
 
 // An animation curve is a function that returns a value given a time.
 class CC_ANIMATION_EXPORT AnimationCurve {
@@ -68,7 +69,7 @@ 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,