a1b5b42d5552c1d6d90acf651e1898efae7177c8
(This is a merge of http://go/wvgerrit/70666) We need a reader-writer lock implementation in order to make use of the new threading guarantees in OEMCrypto v15. However, we do not have access to an STL reader-writer lock due to only being on C++11. This patch adds a home-grown reader-writer lock, as well as tests to verify that its behavior is sound. Bug: 70889998 Bug: 118584039 Test: CE CDM Unit Tests Test: Android Unit Tests Change-Id: Iaddcefb50e72452fbd27d04879eacf775484e675
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