[Disable Flags Logging] Add logging for QSFragment, since it locally
modifies the disable flags.

This is the last class that modifies disable flags, so marking the bug
as fixed.

Fixes: 197851207
Test: dumped LogBuffer and verified correctness
Test: atest QSFragmentDisableFlagsLoggerTest
Change-Id: Ife299190c72bd943aa97050f8a364621ef192cf8
7 files changed