Merge "Allow to move frames out of Unwinder."

  const std::vector<FrameData>& frames() { return frames_; }

  std::vector<FrameData> ConsumeFrames() {

    std::vector<FrameData> frames = std::move(frames_);

    frames_.clear();

    return frames;

  }

  std::string FormatFrame(size_t frame_num);

  static std::string FormatFrame(const FrameData& frame, bool is32bit);