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Hide speexdsp's echo cancellation implementation details behind an EchoCanceller derived class. An AudioLayer may now instantiate implementations of the EchoCanceller. This may be platform specific compile-time or swapped out at runtime. Introduces a null echo canceller for testing. As the speexdsp aec is not currently functional, the null echo canceller is replaced as the default implementation. GitLab: #454 Change-Id: I169f1e9758afbed884fc42d9d78a69ce28d12fe2
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