Add use of std::chrono::steady_clock into cv::getTickCount implementation when C++11 is available #6902
Description
- OpenCV => 3.x
- Operating System / Platform => any / c++11
- Compiler => any c++11
Detailed description
C++11 implements the standard ISO.20.11.7 in std::chrono, so it has much sense using this standard portable implementation inside cv::getTickCount when compiler supports it.