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Because Gnubby and power gnubby in chromium would be considered as
HID devices, and this CL would enable HID devices support for LaCrOS.

Before this CL: Lacros would try to access /dev/hidraw*, but the
permission of it is root:hidraw 660, and lacros is running in chronos
user permission. By the way, CrOS it is using dbus to access the
permission_broker, and permission_broker would access these files for CrOS.

In this CL: Open a HidManager mojo between ash-chrome service and lacros service.
Lacros would use AddReceiver to add a receiver to ash-chrome's HidManager.
And the HidManager on ash-chrome would use permission_broker to access
/dev/hidraw* files. In this solution, we wouldn't need to compile the
permission_broker into lacros.

BUG=chromium:1109621
TEST=tested gnubby manually on soraka

Change-Id: I18cfe9b5e93e260b9347df4b57ebe12a621f44a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2319089
Commit-Queue: joe Chou <yich@google.com>
Reviewed-by: Greg Kerr <kerrnel@chromium.org>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800003}