Include <chrono> for system_clock #8668

Job	Run time
pre-flight-check	51s
build-test-ubuntu-32-bit	15m 17s
build-test-ubuntu-32-64-bit-mix-mode	21m 32s
build-test-ubuntu	13m 57s
build-test-macos-with-address-sanitizer	5m 25s
build-test-ubuntu-bazel	15m 54s
build-test-ubuntu-with-address-sanitizer-clang-latest	12m 3s
build-test-ubuntu-with-address-sanitizer-gcc-latest	15m 42s
build-test-ubuntu-with-thread-sanitizer-clang-latest	12m 1s
build-test-unix-with-freebsd	14m 13s
build-test-windows-mingw	18m 34s
build-test-windows-msvc	9m 0s
check-status-of-nightly-action	8s
coverage-and-docs	28m 42s
run-integration-test	1h 0m 0s
	4h 3m 19s

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