Repaint windows on screen unlock.

ui/views/win/hwnd_message_handler.h

Index: ui/views/win/hwnd_message_handler.h
diff --git a/ui/views/win/hwnd_message_handler.h b/ui/views/win/hwnd_message_handler.h
index d0b51d2954820f0d4022f8d5c937b31cb4b617dd..60b267f741ae6363e3599f3ce1e50c9570b8e15c 100644
--- a/ui/views/win/hwnd_message_handler.h
+++ b/ui/views/win/hwnd_message_handler.h
@@ -286,6 +286,10 @@ class VIEWS_EXPORT HWNDMessageHandler :
   // layered windows only.
   void RedrawLayeredWindowContents();
 
+  // Attempts to force the window to be redrawn, ensuring that it gets
+  // onscreen.
+  void ForceRedrawWindow(int attempts);
+
   // Message Handlers ----------------------------------------------------------
 
   BEGIN_SAFE_MSG_MAP_EX(HWNDMessageHandler)
@@ -374,6 +378,7 @@ class VIEWS_EXPORT HWNDMessageHandler :
     MSG_WM_THEMECHANGED(OnThemeChanged)
     MSG_WM_WINDOWPOSCHANGED(OnWindowPosChanged)
     MSG_WM_WINDOWPOSCHANGING(OnWindowPosChanging)
+    MSG_WM_WTSSESSION_CHANGE(OnSessionChange)
   END_MSG_MAP()
 
   // Message Handlers.
@@ -418,6 +423,7 @@ class VIEWS_EXPORT HWNDMessageHandler :
   void OnPaint(HDC dc);
   LRESULT OnReflectedMessage(UINT message, WPARAM w_param, LPARAM l_param);
   LRESULT OnScrollMessage(UINT message, WPARAM w_param, LPARAM l_param);
+  void OnSessionChange(WPARAM status_code, PWTSSESSION_NOTIFICATION session_id);
   LRESULT OnSetCursor(UINT message, WPARAM w_param, LPARAM l_param);
   void OnSetFocus(HWND last_focused_window);
   LRESULT OnSetIcon(UINT size_type, HICON new_icon);