Add VideoLayout message.

remoting/client/client_user_interface.h

Index: remoting/client/client_user_interface.h
diff --git a/remoting/client/client_user_interface.h b/remoting/client/client_user_interface.h
index be578d2ac7fa75579e27ee2c52c91218afd3d6e5..140aa02900f907ac2d7549168acb965a277696c1 100644
--- a/remoting/client/client_user_interface.h
+++ b/remoting/client/client_user_interface.h
@@ -11,6 +11,11 @@
 #include "remoting/protocol/connection_to_host.h"
 #include "remoting/protocol/third_party_client_authenticator.h"
 
+namespace webrtc {
+class DesktopSize;
+class DesktopVector;
+}  // namespace webrtc
+
 namespace remoting {
 
 namespace protocol {
@@ -48,6 +53,10 @@ class ClientUserInterface {
   virtual void DeliverHostMessage(
       const protocol::ExtensionMessage& message) = 0;
 
+  // Notify the client about screen dimensions.
+  virtual void SetDesktopSize(const webrtc::DesktopSize& size,
+                              const webrtc::DesktopVector& dpi) = 0;
+
   // Get the view's ClipboardStub implementation.
   virtual protocol::ClipboardStub* GetClipboardStub() = 0;