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This cl adds the following:
1. A new API GetSystemInformation in crosapi::LacrosChromeService
to gather Lacros system information which is called from ash.
2. A new SystemLogsSource LacrosSystemLogRemoteSource to fetch
Lacros system log data.

The unified feedback report will include the additional lacros
system information data, and each log entry key with be prefixed
with "Lacros ", so that it can be differentiate from the ash
system information log entries. The unified feedback will include
additional lacros log data such as crash report ids, extensions,
memory usage, etc, in system_logs.zip of the feedback report.

TEST:
1. Open Lacros chrome, file a feedback from "Help/Report an issue"
menu, send a feedback report. Find the report on listnr, download
system_logs.zip and check the content. In addition to ash log data,
it should include:
Lacros CHROME VERSION
Lacros OS VERSION
Lacros about_sync_data
Lacros crash_report_ids
Lacros data_reduction_proxy
Lacros extensions
lacros mem_usgae
Lacros mem_usage_with_title

Also, clicking on "system and app information" link on feedback
dialog, it will show all system log data in a preview UI, which
should also display the above Larcros log entries along with ash
log entries.

2. File a feedback report from ash chrome, make sure there is a
Lacros chrome running. It should send a unified feedback report
which includes the additional Lacros system information as shown
in Test #1.


Bug: 1119925
Change-Id: Ied42b2674dbb68bfed39d119bb7e70e2a177c762
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2465090Reviewed-by: Miriam Zimmerman <mutexlox@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Greg Kerr <kerrnel@chromium.org>
Commit-Queue: Jenny Zhang <jennyz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817579}