Revert "Revert "Add support for ProtoLogging without any source ..."

Revert submission 28207894-revert-28147757-no-processing-protolog-IJZXUZOQGO

Reason for revert: Re-landing change

Reverted changes: /q/submissionid:28207894-revert-28147757-no-processing-protolog-IJZXUZOQGO

Change-Id: I38e2c4ce38c6d5d56801b93213d068a8feb3d62d
7 files changed