[CRD iOS] Some fixes for rendering

remoting/client/desktop_viewport.cc

 // 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.
 
 #include "remoting/client/desktop_viewport.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 
 namespace remoting {
 
 namespace {
 
 float MAX_ZOOM_LEVEL = 100.f;
 
 }  // namespace
 
 DesktopViewport::DesktopViewport() : desktop_to_surface_transform_() {}
 
 DesktopViewport::~DesktopViewport() {}
 
 void DesktopViewport::SetDesktopSize(int desktop_width, int desktop_height) {
+  if (desktop_width == desktop_size_.x && desktop_height == desktop_size_.y) {
+    return;
+  }
+
   desktop_size_.x = desktop_width;
   desktop_size_.y = desktop_height;
   ResizeToFit();
 }
 
 void DesktopViewport::SetSurfaceSize(int surface_width, int surface_height) {
+  if (surface_width == surface_size_.x && surface_height == surface_size_.y) {
+    return;
+  }
+
   surface_size_.x = surface_width;
   surface_size_.y = surface_height;
   ResizeToFit();
 }
 
 void DesktopViewport::MoveDesktop(float dx, float dy) {
   desktop_to_surface_transform_.PostTranslate({dx, dy});
   UpdateViewport();
 }
 
@@ skipping 189 matching lines @@
 
   if (new_point.y < bounds.top) {
     new_point.y = bounds.top;
   } else if (new_point.y > bounds.bottom) {
     new_point.y = bounds.bottom;
   }
   return new_point;
 }
 
 }  // namespace remoting