Add ProductionFlag.IS_EXPERIMENTAL_DEBUG

The IS_EXPERIMENTAL_DEBUG flag gives a single place to turn off all debugging flags that might be
set and to also enforce privacy controls.  Currently only used in the research package.

multi-project commit with I9275a7c8e40bf56106447a02d3056655329074b3

Change-Id: If769fe3a633f33963ca49e8ddf01ab24a30b6fd2