Blink Compositor Animation: Make Animation and Curve methods non-virtual.

cc/animation/keyframed_animation_curve.h

Index: cc/animation/keyframed_animation_curve.h
diff --git a/cc/animation/keyframed_animation_curve.h b/cc/animation/keyframed_animation_curve.h
index 6e26875467211a71de469ba355f539b59c0324c8..8f76e422d73154d1d638f362350760221bef8558 100644
--- a/cc/animation/keyframed_animation_curve.h
+++ b/cc/animation/keyframed_animation_curve.h
@@ -153,9 +153,13 @@ class CC_EXPORT KeyframedFloatAnimationCurve : public FloatAnimationCurve {
   ~KeyframedFloatAnimationCurve() override;
 
   void AddKeyframe(std::unique_ptr<FloatKeyframe> keyframe);
+
   void SetTimingFunction(std::unique_ptr<TimingFunction> timing_function) {
     timing_function_ = std::move(timing_function);
   }
+  TimingFunction* timing_function_for_testing() const {
+    return timing_function_.get();
+  }
 
   // AnimationCurve implementation
   base::TimeDelta Duration() const override;
@@ -164,12 +168,15 @@ class CC_EXPORT KeyframedFloatAnimationCurve : public FloatAnimationCurve {
   // FloatAnimationCurve implementation
   float GetValue(base::TimeDelta t) const override;
 
+  using Keyframes = std::vector<std::unique_ptr<FloatKeyframe>>;
+  const Keyframes& keyframes_for_testing() const { return keyframes_; }
+
  private:
   KeyframedFloatAnimationCurve();
 
   // Always sorted in order of increasing time. No two keyframes have the
   // same time.
-  std::vector<std::unique_ptr<FloatKeyframe>> keyframes_;
+  Keyframes keyframes_;
   std::unique_ptr<TimingFunction> timing_function_;
 
   DISALLOW_COPY_AND_ASSIGN(KeyframedFloatAnimationCurve);