am b7cfc618: am 28fb09e0: cherry pick Change-Id: I183ff47e59617b2c17a92b876ca8c8bcc9b45262 docs: add document for the compatibility library
* commit 'b7cfc6181be090cc93d304a96e035f5a754085ae': cherry pick Change-Id: I183ff47e59617b2c17a92b876ca8c8bcc9b45262 docs: add document for the compatibility library
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