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This is a reland of e2eb7388

System log collection is enabled by specifying a --enable-fuchsia-system-log argument which causes the test runner scripts to write the fuchsia system log to the test system_log file instead of writing the fuchsia kernel log file.

Original change's description:
> [fuchsia] Collect Fuchsia system logs from Chrome-Fuchsia tests.
>
> The Fuchsia system logs contain more detailed information than the Fuchsia kernel logs.
>
> Currently only Fuchsia kernel logs are collected.  The kernel logs are:
> - written to the swarming task output log along with the actual test output
> - optionally written to a "system_log" file in the test isolate output
>
> This CL will:
> - optionally write the Fuchsia system log to a "log_listener_log" in the test isolate output
>
> The Fuchsia system log will be written if the kernel log is written.
>
> The Fuchsia system log is written to "log_listener_log".  The name "log_listener_log" was used because the Fuchsia kernel log contents are already saved in "system_log".
>
> Bug: 1042512
> Change-Id: I900b5dfe9f6587f1901c19612060b979fae4da99
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2130679
> Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
> Commit-Queue: Stephen Roe <steveroe@google.com>
> Cr-Commit-Position: refs/heads/master@{#756118}

Bug: 1042512
Change-Id: I9edf2991e697e09b81b7c206cce0de04ca42b500
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2136143
Commit-Queue: Stephen Roe <steveroe@google.com>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758636}