Adding support for sending/receiving proto bufs to dbus library.
This CL add in support to dbus wrapping classes to send and receive protocol
buffers. They take in a generic MessageLite, which all protocol buffers inherit
from. It will then serialize the buffer and send it out as an array of bytes. On
receiving the array of bytes will be parsed back into a protocol buffer. The
operations for doing this are very canned and these methods are designed to
allow devs to skip writing boilerplate. The methods are just wrappers around the
appopriate byte array methods.
TEST=Ran new unittests
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