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

remoting/host/event_executor_mac.cc

Index: remoting/host/event_executor_mac.cc
diff --git a/remoting/host/event_executor_mac.cc b/remoting/host/event_executor_mac.cc
index cb6583248df63b643acbd654cfea82aa0146b72b..fbe974249d99f12c4cb983fb979b96d522d0d950 100644
--- a/remoting/host/event_executor_mac.cc
+++ b/remoting/host/event_executor_mac.cc
@@ -19,8 +19,9 @@ namespace remoting {
 
 namespace {
 
-using protocol::MouseEvent;
+using protocol::ClipboardEvent;
 using protocol::KeyEvent;
+using protocol::MouseEvent;
 
 // A class to generate events on Mac.
 class EventExecutorMac : public EventExecutor {
@@ -28,6 +29,7 @@ class EventExecutorMac : public EventExecutor {
   EventExecutorMac(MessageLoop* message_loop, Capturer* capturer);
   virtual ~EventExecutorMac() {}
 
+  virtual void InjectClipboardEvent(const ClipboardEvent& event) OVERRIDE;
   virtual void InjectKeyEvent(const KeyEvent& event) OVERRIDE;
   virtual void InjectMouseEvent(const MouseEvent& event) OVERRIDE;
 
@@ -211,6 +213,10 @@ const int kUsVkeyToKeysym[256] = {
   /* VKEY_NONAME */ -1, /* VKEY_PA1 */ -1, /* VKEY_OEM_CLEAR */ -1, -1
 };
 
+void EventExecutorMac::InjectClipboardEvent(const ClipboardEvent& event) {
+  // TODO(simonmorris): Implement clipboard injection.
+}
+
 void EventExecutorMac::InjectKeyEvent(const KeyEvent& event) {
   int key_code = event.keycode();
   if (key_code >= 0 && key_code < 256) {