code: public int findAnimation(GVRAnimation findme)
      {
          int index = 0;
          for (GVRAnimation anim : mAnimations)
          {
              if (anim == findme)
              {
                  return index;
              }
              ++index;
          }
          return -1;
      }
docs: Find the index of this animation if it is in this animator.
  
  @param findme    {@link GVRAnimation} to find.
  @returns 0 based index of animation or -1 if not found
  @see GVRAnimator#addAnimation(GVRAnimation)