GitLab

This CL moves storing of crOS system logs from chrome://net-internals
(which is deprecated) to chrome://network.

This also re-factors the UI code as a separate handler that supports
multiple options, instead of disparate function calls doing similar
tasks. See the issue for screenshots.

      debugging logs are exported to the Downloads directory.

Bug: 921726
Test: Export logs with each set of options and ensure that the correct
Change-Id: I2ddbbc936edc7251cda0e69a9faf6289d3794ef2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2258894Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Eric Roman <eroman@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781978}