Support task tracer #1595

Job	Run time
clang-compile-with-bazel	15m 59s
clang-compile-with-bazel-all-options	16m 53s
clang-compile-with-boringssl	17m 58s
clang-compile-with-cmake	2m 47s
clang-compile-with-cmake-all-options	5m 34s
clang-compile-with-make	3m 9s
clang-compile-with-make-all-options	4m 43s
clang-unittest	11m 21s
gcc-compile-with-bazel	16m 42s
gcc-compile-with-bazel-all-options	18m 26s
gcc-compile-with-cmake-all-options	5m 24s
gcc-compile-with-cmake	3m 36s
gcc-compile-with-boringssl	18m 3s
gcc-compile-with-make	2m 36s
gcc-compile-with-make-all-options	5m 0s
	2h 28m 11s

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