docs: public void addChannel(String boneName, GVRAnimationChannel channel)
      {
          int boneId = mSkeleton.getBoneIndex(boneName);
          if (boneId >= 0)
          {
              mBoneChannels[boneId] = channel;
              mSkeleton.setBoneOptions(boneId, GVRSkeleton.BONE_ANIMATE);
              Log.d("BONE", "Adding animation channel %d %s ", boneId, boneName);
          }
      }