Add a helper function to add std::string values (having an indeterminate encoding) to NetLog.

Bug: 657115
Change-Id: I1d0171d5e7a2c06ca81271869bc5dcab27c58dca
Reviewed-on: https://chromium-review.googlesource.com/c/1366759
Commit-Queue: Eric Roman <eroman@chromium.org>
Reviewed-by: Bence Béky <bnc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614864}
7 files changed