Yang Gao bd18be2f33 add compute engine credentials support %!s(int64=11) %!d(string=hai) anos
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build 297fafa078 Opportunistically use perftools if installed. %!s(int64=11) %!d(string=hai) anos
core 3ed874c861 sync up with master %!s(int64=11) %!d(string=hai) anos
cpp bd18be2f33 add compute engine credentials support %!s(int64=11) %!d(string=hai) anos