Add ClientDimensions message to control channel.

remoting/protocol/client_control_dispatcher.h

Index: remoting/protocol/client_control_dispatcher.h
diff --git a/remoting/protocol/client_control_dispatcher.h b/remoting/protocol/client_control_dispatcher.h
index 3f3c13421b5981b80bc6273eefb3764f49d743d7..422f5185e392e81a1cf5fb2b328ce4d94884d0ee 100644
--- a/remoting/protocol/client_control_dispatcher.h
+++ b/remoting/protocol/client_control_dispatcher.h
@@ -32,6 +32,10 @@ class ClientControlDispatcher : public ChannelDispatcherBase,
   // ClipboardStub implementation.
   virtual void InjectClipboardEvent(const ClipboardEvent& event) OVERRIDE;
 
+  // HostStub implementation.
+  virtual void NotifyClientDimensions(
+      const ClientDimensions& dimensions) OVERRIDE;
+
   // Sets the ClientStub that will be called for each incoming control
   // message. |client_stub| must outlive this object.
   void set_client_stub(ClientStub* client_stub) { client_stub_ = client_stub; }