Scott Main 28fb09e0b2 cherry pick Change-Id: I183ff47e59617b2c17a92b876ca8c8bcc9b45262
docs: add document for the compatibility library

Change-Id: I1825ae1fba0be664a7c6a8b0ba32166f216a893f
2011-05-26 15:16:01 -07:00
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