docs: public GVRPose computeSkinPose()
      {
          if (mInverseBindPose == null)
          {
              return null;
          }
          mPose.sync();
          if (mSkinPose == null)
          {
              mSkinPose = new GVRPose(mPose);
          }
          else
          {
              mSkinPose.copy(mPose);
          }
          mSkinPose.combine(mInverseBindPose);
          return mSkinPose;
      }