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

remoting/host/event_executor_linux.cc

Index: remoting/host/event_executor_linux.cc
diff --git a/remoting/host/event_executor_linux.cc b/remoting/host/event_executor_linux.cc
index f2e68b85004f682ee59b3e6a579229fc13aa692a..1e9da94b5d3868f06e21701ac9242b1976943272 100644
--- a/remoting/host/event_executor_linux.cc
+++ b/remoting/host/event_executor_linux.cc
@@ -20,8 +20,9 @@
 
 namespace remoting {
 
-using protocol::MouseEvent;
+using protocol::ClipboardEvent;
 using protocol::KeyEvent;
+using protocol::MouseEvent;
 
 namespace {
 
@@ -33,6 +34,7 @@ class EventExecutorLinux : public EventExecutor {
 
   bool Init();
 
+  virtual void InjectClipboardEvent(const ClipboardEvent& event) OVERRIDE;
   virtual void InjectKeyEvent(const KeyEvent& event) OVERRIDE;
   virtual void InjectMouseEvent(const MouseEvent& event) OVERRIDE;
 
@@ -299,6 +301,10 @@ bool EventExecutorLinux::Init() {
   return true;
 }
 
+void EventExecutorLinux::InjectClipboardEvent(const ClipboardEvent& event) {
+  // TODO(simonmorris): Implement clipboard injection.
+}
+
 void EventExecutorLinux::InjectKeyEvent(const KeyEvent& event) {
   if (MessageLoop::current() != message_loop_) {
     message_loop_->PostTask(