(This is a merge of http://go/wvgerrit/70383)
Up until now, implementations of Properties::Init() have had to handle
potentially being called multiple times, at any point during runtime. In
practice, this has meant little for the actual implementations, and all
of them have committed the error of blowing away mutated property state
if the method is re-run at the wrong time.
This patch makes the platform implementations a private function,
Properties::InitOnce(), which Properties::Init() ensures will never be
called more than once per run.
Bug: 112046733
Test: CE CDM Unit Tests
Test: Android Unit Tests
Change-Id: If33f5e37abfad5d26da8380b4bc25fc018450970
86efc7534a