[Cherry Pick] Refactor CronetLoggerImpl to send default values

* This is needed in order for framework-tethering to not break the moment we change the atoms structure. The newly reported values are useless, they will
be changed once the implementation for the atoms reporting is there.

Test: m framework-tethering
Merged-In: I328d79c389753c48aa0f851220c783642cb0cba4
Change-Id: Ic50cdd85ba873cf14fc20a840e07642ca85eb871
1 file changed