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When user invokes feedback from lacros-chrome, we will send
the request via crosapi mojo call to ash to show Feedback ui,
so that the feedback report will be sent from ash, which includes
both ash and lacros user log.

The chrome version string in feedback report will contain both ash
and lacros versions if Lacros is allowed/supported and launched
in the session.

Bug:1119925
TEST:
1. Open Lacros browser, send a feedback report by clicking
"Report an issue" under Help menu.
2. Verify the report can be found at
http://listnr site. The chrome version string should have
both lacros and ash version strings, for example, "Lacros 87.0.4266.0 dev, Ash 87.0.4266.0 dev".
3. Verify the report contains both system_logs.zip and histograms.zip.
The system log should contain ash log data and lacros user log from
/home/chronos/user/lacros/lacros.log under "lacros_user_log" section.

Change-Id: Iecc94ef9c50d6993159aebd9d3ac305e3f9a5896
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2408883Reviewed-by: Greg Kerr <kerrnel@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Miriam Zimmerman <mutexlox@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Jenny Zhang <jennyz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811454}