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

remoting/protocol/input_filter.cc

Index: remoting/protocol/input_filter.cc
diff --git a/remoting/protocol/input_filter.cc b/remoting/protocol/input_filter.cc
index c9be6a11ed59fb765b3df81acc0aea5c0166eb95..500073b1b87ccbc12f264c7cf5b2f1f56e2b5448 100644
--- a/remoting/protocol/input_filter.cc
+++ b/remoting/protocol/input_filter.cc
@@ -13,6 +13,11 @@ InputFilter::InputFilter() : input_stub_(NULL) {
 InputFilter::~InputFilter() {
 }
 
+void InputFilter::InjectClipboardEvent(const ClipboardEvent& event) {
+  if (input_stub_ != NULL)
+    input_stub_->InjectClipboardEvent(event);
+}
+
 void InputFilter::InjectKeyEvent(const KeyEvent& event) {
   if (input_stub_ != NULL)
     input_stub_->InjectKeyEvent(event);