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

remoting/protocol/host_event_dispatcher.cc

Index: remoting/protocol/host_event_dispatcher.cc
diff --git a/remoting/protocol/host_event_dispatcher.cc b/remoting/protocol/host_event_dispatcher.cc
index 22cee04c9e434b75dee384652e80d6c609944d4a..b35145f8fd8c22202036efad5fef39dc70933480 100644
--- a/remoting/protocol/host_event_dispatcher.cc
+++ b/remoting/protocol/host_event_dispatcher.cc
@@ -9,6 +9,7 @@
 #include "remoting/base/constants.h"
 #include "remoting/proto/event.pb.h"
 #include "remoting/proto/internal.pb.h"
+#include "remoting/protocol/clipboard_stub.h"
 #include "remoting/protocol/input_stub.h"
 
 namespace remoting {
@@ -16,6 +17,7 @@ namespace protocol {
 
 HostEventDispatcher::HostEventDispatcher()
     : ChannelDispatcherBase(kEventChannelName),
+      clipboard_stub_(NULL),
       input_stub_(NULL) {
 }
 
@@ -29,6 +31,7 @@ void HostEventDispatcher::OnInitialized() {
 
 void HostEventDispatcher::OnMessageReceived(
     EventMessage* message, const base::Closure& done_task) {
+  DCHECK(clipboard_stub_);
   DCHECK(input_stub_);
 
   base::ScopedClosureRunner done_runner(done_task);
@@ -44,6 +47,8 @@ void HostEventDispatcher::OnMessageReceived(
     }
   } else if (message->has_mouse_event()) {
     input_stub_->InjectMouseEvent(message->mouse_event());
+  } else if (message->has_clipboard_event()) {
+    clipboard_stub_->InjectClipboardEvent(message->clipboard_event());
   } else {
     LOG(WARNING) << "Unknown event message received.";
   }