Support repeatMode = reverse in AVD

BUG: 30641232
Change-Id: I34c823a0a45c8441873a9b467275174c5529994b
diff --git a/libs/hwui/Animator.h b/libs/hwui/Animator.h
index 9476750..259f21b 100644
--- a/libs/hwui/Animator.h
+++ b/libs/hwui/Animator.h
@@ -44,6 +44,12 @@
     ANDROID_API virtual ~AnimationListener() {}
 };
 
+enum class RepeatMode {
+    // These are the same values as the RESTART and REVERSE in ValueAnimator.java.
+    Restart = 1,
+    Reverse = 2
+};
+
 class BaseRenderNodeAnimator : public VirtualLightRefBase {
     PREVENT_COPY_AND_ASSIGN(BaseRenderNodeAnimator);
 public: