[CRD iOS] Move UI stuff into a subdirectory

remoting/client/ui/desktop_viewport.h

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef REMOTING_CLIENT_DESKTOP_VIEWPORT_H_
-#define REMOTING_CLIENT_DESKTOP_VIEWPORT_H_
+#ifndef REMOTING_CLIENT_UI_DESKTOP_VIEWPORT_H_
+#define REMOTING_CLIENT_UI_DESKTOP_VIEWPORT_H_
 
 #include "base/callback.h"
-#include "remoting/client/view_matrix.h"
+#include "remoting/client/ui/view_matrix.h"
 
 namespace remoting {
 
 // The viewport is a sliding window on the desktop image. This class defines
 // the viewport's position and size, provides methods to manipulate it, and
 // outputs a desktop space -> surface space transformation matrix for drawing
 // the desktop onto the client's view surface on the screen.
 //
 // Desktop space: Coordinates to locate a point on the host's desktop image in
 //     pixels, similar to the mouse's cursor position.
@@ skipping 87 matching lines @@
   ViewMatrix desktop_to_surface_transform_;
 
   TransformationCallback on_transformation_changed_;
 
   // DesktopViewport is neither copyable nor movable.
   DesktopViewport(const DesktopViewport&) = delete;
   DesktopViewport& operator=(const DesktopViewport&) = delete;
 };
 
 }  // namespace remoting
-#endif  // REMOTING_CLIENT_DESKTOP_VIEWPORT_H_
+#endif  // REMOTING_CLIENT_UI_DESKTOP_VIEWPORT_H_