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It is possible to infer the capture mode (which limits how much
sensitive information is stored in a NetLog file) by scanning emitted
events, but explicitly recording the capture mode in the file enables
automated tooling to more easily classify logs.

Bug: 1057773
Change-Id: Ia36fb2cbb091cf2b4a940fbe48fce87269438c33
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2087702Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Eric Roman <eroman@chromium.org>
Commit-Queue: Eric Lawrence [MSFT] <ericlaw@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#815833}