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Often testers and users need to generate system logs for debugging.
(See issue for details on why this is important / helpful).

Currently these only include logs gathered by debugd, and Chrome user
logs.

Feedback reports also gather "device logs" (chrome://device-logs) that
can be helpful for investigating networking issues.

This CL provides a separate section for writing system_logs.txt.zip to
the Downloads directory instead of the individual files gathered by
debugd, with text explaining the differences and encouraging the use
of system_logs for attaching to issues or sending to developers since
that file is compatible with logprocessor and Android Bug Tool for
easier analysis.

Note: No existing functionality has been removed.

Bug: 841441
Change-Id: I1d0423eff8c6e43cfec0b4d24e81e174ef09a1af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2136049
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Eric Roman <eroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757580}