Fix theme change paint issue on linux.

ui/views/win/hwnd_message_handler.cc

Index: ui/views/win/hwnd_message_handler.cc
diff --git a/ui/views/win/hwnd_message_handler.cc b/ui/views/win/hwnd_message_handler.cc
index 810b9cb02018c7813b8ee5ad342c21d75791858b..ac7645344f2e60f7ce4fe9484df2342fe752e60c 100644
--- a/ui/views/win/hwnd_message_handler.cc
+++ b/ui/views/win/hwnd_message_handler.cc
@@ -827,10 +827,6 @@ void HWNDMessageHandler::SetWindowIcons(const gfx::ImageSkia& window_icon,
 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.
@@ -843,6 +839,10 @@ void HWNDMessageHandler::SetFullscreen(bool fullscreen) {
     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

[sky, 2017/03/13 15:41:42]

Is this move needed? Why?

[ananta, 2017/03/13 19:48:03]

Was seeing a DCHECK at times in debug builds when the window comes out of
fullscreen and window pos changing thinks it is still a fullscreen window due to
the above map.

+  // window, then go ahead and do it now.
+  if (!fullscreen && dwm_transition_desired_)
+    PerformDwmTransition();
 }
 
 void HWNDMessageHandler::SizeConstraintsChanged() {