Add Mac and Win Clang upload bots (src part).
Add Mac and Win Clang upload bots (src part).

This is similar to https://codereview.chromium.org/1692583002/

BUG=578306

Review URL: https://codereview.chromium.org/1741603002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#377776}

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