Repaint windows on screen unlock.

ui/base/win/lock_state.cc

+// Copyright (c) 2014 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/base/win/lock_state.h"
+
+#include <windows.h>
+
+namespace ui {
+
+bool IsWorkstationLocked() {
+  bool is_locked = true;
+  HDESK input_desk = ::OpenInputDesktop(0, 0, GENERIC_READ);
+  if (input_desk) {
+    wchar_t name[256] = {0};
+    DWORD needed = 0;
+    if (::GetUserObjectInformation(
+            input_desk, UOI_NAME, name, sizeof(name), &needed)) {
+      is_locked = lstrcmpi(name, L"default") != 0;
+    }
+    ::CloseDesktop(input_desk);
+  }
+  return is_locked;
+}
+
+}  // namespace ui