Fix theme change paint issue on linux.

ui/views/win/hwnd_message_handler.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/win/hwnd_message_handler.h"
 
 #include <dwmapi.h>
 #include <oleacc.h>
 #include <shellapi.h>
 #include <tchar.h>
@@ skipping 810 matching lines @@
     base::win::ScopedHICON previous_icon = std::move(app_icon_);
     app_icon_ = IconUtil::CreateHICONFromSkBitmap(*app_icon.bitmap());
     SendMessage(hwnd(), WM_SETICON, ICON_BIG,
                 reinterpret_cast<LPARAM>(app_icon_.get()));
   }
 }
 
 void HWNDMessageHandler::SetFullscreen(bool fullscreen) {
   background_fullscreen_hack_ = false;
   fullscreen_handler()->SetFullscreen(fullscreen);
-  // If we are out of fullscreen and there was a pending DWM transition for the
-  // window, then go ahead and do it now.
-  if (!fullscreen && dwm_transition_desired_)
-    PerformDwmTransition();
 
   // Add the fullscreen window to the fullscreen window map which is used to
   // handle window activations.
   HMONITOR monitor = MonitorFromWindow(hwnd(), MONITOR_DEFAULTTOPRIMARY);
   if (fullscreen) {
     (fullscreen_monitor_map_.Get())[monitor] = this;
   } else {
     FullscreenWindowMonitorMap::iterator iter =
         fullscreen_monitor_map_.Get().find(monitor);
     if (iter != fullscreen_monitor_map_.Get().end())
       fullscreen_monitor_map_.Get().erase(iter);
   }
+  // If we are out of fullscreen and there was a pending DWM transition for the
+  // window, then go ahead and do it now.
+  if (!fullscreen && dwm_transition_desired_)
+    PerformDwmTransition();
 }
 
 void HWNDMessageHandler::SizeConstraintsChanged() {
   LONG style = GetWindowLong(hwnd(), GWL_STYLE);
   // Ignore if this is not a standard window.
   if (style & (WS_POPUP | WS_CHILD))
     return;
 
   LONG exstyle = GetWindowLong(hwnd(), GWL_EXSTYLE);
   // Windows cannot have WS_THICKFRAME set if WS_EX_COMPOSITED is set.
@@ skipping 1924 matching lines @@
   MONITORINFO monitor_info = {sizeof(monitor_info)};
   GetMonitorInfo(MonitorFromWindow(hwnd(), MONITOR_DEFAULTTOPRIMARY),
                  &monitor_info);
   gfx::Rect shrunk_rect(monitor_info.rcMonitor);
   shrunk_rect.set_height(shrunk_rect.height() - 1);
   background_fullscreen_hack_ = true;
   SetBoundsInternal(shrunk_rect, false);
 }
 
 }  // namespace views