Add Sanity Check for Plugin Logic

Add Sanity Check for Plugin Logic

Plugin logic is used in bundle and some functions from this module are used as
registered callbacks from webkit.
In general this commits only adds logs, but it may be very helpful in
debuging problems with some race condition caused by bundle.

[Issue#] N/A
[Problem] N/A
[Cause] N/A
[Solution] N/A
[SCMRequest] N/A

Change-Id: Id69bb144891aeb7ef2ed40490bc61c993a0df615