Fix for Ia9baaf0b: Make previously public variables public again

Change Ia9baaf0b changed the visibility of member variables (many of which are not
otherwise exposed, e.g. by a method) and by that introduced a major API change
breaking extensions.

This patch explicitly marks affected variables as public again, keeping the intent
of the original patch of making phpcs-strict pass on includes/ directory.

Bug: 67522
Bug: 67984
Change-Id: I498512b2a1e615365bb477c1fd210aaa3241ca03
Merge "Fix for Ia9baaf0b: Make previously public variables public again"