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

remoting/protocol/client_event_dispatcher.h

Index: remoting/protocol/client_event_dispatcher.h
diff --git a/remoting/protocol/client_event_dispatcher.h b/remoting/protocol/client_event_dispatcher.h
index 0b694014f7535ef3f256bbcd129ea85b7127392f..96339cd4e0b255b7ee304da60e13096e319d1db4 100644
--- a/remoting/protocol/client_event_dispatcher.h
+++ b/remoting/protocol/client_event_dispatcher.h
@@ -7,6 +7,7 @@
 
 #include "base/memory/ref_counted.h"
 #include "remoting/protocol/channel_dispatcher_base.h"
+#include "remoting/protocol/clipboard_stub.h"
 #include "remoting/protocol/input_stub.h"
 
 namespace remoting {
@@ -15,12 +16,18 @@ namespace protocol {
 class BufferedSocketWriter;
 
 // ClientEventDispatcher manages the event channel on the client
-// side. It implements InputStub for outgoing input messages.
-class ClientEventDispatcher : public ChannelDispatcherBase, public InputStub {
+// side. It implements InputStub and ClipboardStub for outgoing input and
+// clipboard messages.
+class ClientEventDispatcher : public ChannelDispatcherBase,
+                              public ClipboardStub,
+                              public InputStub {
  public:
   ClientEventDispatcher();
   virtual ~ClientEventDispatcher();
 
+  // ClipboardStub implementation.
+  virtual void InjectClipboardEvent(const ClipboardEvent& event) OVERRIDE;
+
   // InputStub implementation.
   virtual void InjectKeyEvent(const KeyEvent& event) OVERRIDE;
   virtual void InjectMouseEvent(const MouseEvent& event) OVERRIDE;