Ensure window border icons repaint when DWM is enabled

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 9b40b5089d88dca57f1a446cb805ed2431a6d7e1..e3171ece9ef060da1cdc464262dc8a37ea96347c 100644
--- a/ui/views/win/hwnd_message_handler.cc
+++ b/ui/views/win/hwnd_message_handler.cc
@@ -2638,8 +2638,14 @@ bool HWNDMessageHandler::HandleMouseInputForCaption(unsigned int message,
       break;
     }
 
-    case WM_NCMOUSELEAVE:
+    case WM_NCMOUSELEAVE: {
+      // If the DWM is rendering the window controls, we need to give the DWM's
+      // default window procedure the chance to repaint the window border icons
+      if (HasSystemFrame()) {

[sky, 2016/08/15 22:03:50]

no {}

[elawrence, 2016/08/16 16:00:49]

Done.

+        handled = DwmDefWindowProc(hwnd(), WM_NCMOUSELEAVE, 0, 0, NULL) != 0;
+      }
       break;
+    }
 
     default:
       left_button_down_on_caption_ = false;