Add VideoLayout message.

remoting/protocol/client_stub.h

Index: remoting/protocol/client_stub.h
diff --git a/remoting/protocol/client_stub.h b/remoting/protocol/client_stub.h
index 79d733982cf3a697ceacc31da1abfacdfa1d4d29..41f35013c44e53866743619bc374b942b33157c3 100644
--- a/remoting/protocol/client_stub.h
+++ b/remoting/protocol/client_stub.h
@@ -20,6 +20,7 @@ namespace protocol {
 class Capabilities;
 class ExtensionMessage;
 class PairingResponse;
+class VideoLayout;
 
 class ClientStub : public ClipboardStub,
                    public CursorShapeStub {
@@ -36,6 +37,9 @@ class ClientStub : public ClipboardStub,
   // Deliver an extension message from the host to the client.
   virtual void DeliverHostMessage(const ExtensionMessage& message) = 0;
 
+  // Sets video layout.
+  virtual void SetVideoLayout(const VideoLayout& video_layout) = 0;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(ClientStub);
 };