Fix another painting regression caused by my patch to address painting problems with the fullscreen…

ui/views/widget/desktop_aura/desktop_window_tree_host_win.cc

 // Copyright (c) 2012 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 "ui/views/widget/desktop_aura/desktop_window_tree_host_win.h"
 
 #include "third_party/skia/include/core/SkPath.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/cursor_client.h"
@@ skipping 895 matching lines @@
   if (compositor())
     compositor()->DisableSwapUntilResize();
 }
 
 void DesktopWindowTreeHostWin::HandleWindowSizeChanged() {
   // A resize may not have occurred if the window size happened not to have
   // changed (can occur on Windows 10 when snapping a window to the side of
   // the screen). In that case do a resize to the current size to reenable
   // swaps.
   if (compositor()) {
-    compositor()->SetScaleAndSize(compositor()->device_scale_factor(),
-                                  GetBounds().size());
+    compositor()->SetScaleAndSize(
+        compositor()->device_scale_factor(),
+        message_handler_->GetClientAreaBounds().size());
   }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopWindowTreeHostWin, private:
 
 Widget* DesktopWindowTreeHostWin::GetWidget() {
   return native_widget_delegate_->AsWidget();
 }
 
@@ skipping 34 matching lines @@
 
 // static
 DesktopWindowTreeHost* DesktopWindowTreeHost::Create(
     internal::NativeWidgetDelegate* native_widget_delegate,
     DesktopNativeWidgetAura* desktop_native_widget_aura) {
   return new DesktopWindowTreeHostWin(native_widget_delegate,
                                       desktop_native_widget_aura);
 }
 
 }  // namespace views