[Chromoting] Let the Windows IT2Me host send clipboard events to the client.

remoting/host/clipboard.h

Index: remoting/host/clipboard.h
diff --git a/remoting/host/clipboard.h b/remoting/host/clipboard.h
index e02c09d2a64831e47a8230911b2d9f9ca2ebbbe8..907726f5e0461e331aa7b7b202eee72198c38aa8 100644
--- a/remoting/host/clipboard.h
+++ b/remoting/host/clipboard.h
@@ -8,6 +8,8 @@
 #include <string>
 
 #include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "remoting/protocol/clipboard_proxy.h"
 
 namespace remoting {
 
@@ -22,7 +24,8 @@ class Clipboard {
   virtual ~Clipboard() {};
 
   // Initialises any objects needed to read from or write to the clipboard.
-  virtual void Start() = 0;
+  virtual void Start(
+      const scoped_refptr<protocol::ClipboardProxy>& client_clipboard) = 0;
 
   // Destroys any objects initialised by Start().
   virtual void Stop() = 0;