Add TProtocolTap: a meta-protocol for "wiretapping".

TProtocolTap is a protocol that passes reads through to a "source" protocol,
but mirrors them as writes to a "sink" protocol.


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665643 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/lib/cpp/Makefile.am b/lib/cpp/Makefile.am
index 07540a1..571c4ff 100644
--- a/lib/cpp/Makefile.am
+++ b/lib/cpp/Makefile.am
@@ -88,6 +88,7 @@
                          src/protocol/TDenseProtocol.h \
                          src/protocol/TDebugProtocol.h \
                          src/protocol/TOneWayProtocol.h \
+                         src/protocol/TProtocolTap.h \
                          src/protocol/TProtocolException.h \
                          src/protocol/TProtocol.h