Add the plumbing that will carry a clipboard item from a chromoting client to a host.

remoting/protocol/client_control_dispatcher.cc

Index: remoting/protocol/client_control_dispatcher.cc
diff --git a/remoting/protocol/client_control_dispatcher.cc b/remoting/protocol/client_control_dispatcher.cc
index e9b7d09c311f7ce6bd69bcd1cc8f88f92dcbe2d6..d8b5baa4fccf4311a1b406310777ded049f27403 100644
--- a/remoting/protocol/client_control_dispatcher.cc
+++ b/remoting/protocol/client_control_dispatcher.cc
@@ -13,6 +13,7 @@
 #include "remoting/proto/internal.pb.h"
 #include "remoting/protocol/buffered_socket_writer.h"
 #include "remoting/protocol/client_stub.h"
+#include "remoting/protocol/util.h"
 
 namespace remoting {
 namespace protocol {
@@ -34,6 +35,13 @@ void ClientControlDispatcher::OnInitialized() {
       &ClientControlDispatcher::OnMessageReceived, base::Unretained(this)));
 }
 
+void ClientControlDispatcher::InjectClipboardEvent(
+    const ClipboardEvent& event) {
+  ControlMessage message;
+  message.mutable_clipboard_event()->CopyFrom(event);
+  writer_->Write(SerializeAndFrameMessage(message), base::Closure());
+}
+
 void ClientControlDispatcher::OnMessageReceived(
     ControlMessage* message, const base::Closure& done_task) {
   DCHECK(client_stub_);