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Interfaces no longer have explicit Peer attributes. An interface may now optionally have a Client interface, in which case a SetClient method will be auto-generated.

InterfacePtr is a proxy to a remote instance of an interface. InterfaceImpl is a base class used when implementing an interface. Both have facilities for binding to a pipe, etc. An InterfacePtr is movable but not copyable and looks a lot like RemotePtr save for how it gets initialized (via the Bind method now).

I've added some new top-level functions:

MakeProxy - makes it easy to initialize an InterfacePtr in say a member initializer list.

BindToPipe - this is how you bind an InterfaceImpl to a pipe. once bound, they cannot be unbound until the object is destroyed or the pipe is closed.

BindToProxy - builds on top of BindToPipe, however, it hides the details of the pipe. What you get back is an InterfacePtr.

Generated C++ code now passes InterfacePtr instead of InterfaceHandle. As a result, we have far less need for typed subclasses of MessagePipeHandle, so I eliminated them. The code that needs to deal with raw handles generally has to deal with {Scoped}MessagePipeHandle, and adding strong typing to these handles doesn't seem helpful anymore.

R=davemoore@chromium.org

Review URL: https://codereview.chromium.org/265793015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269443 0039d316-1c4b-4281-b951-d872f2087c98