Repaint windows on screen unlock.

D3D presents are ignored while the screen is locked, so wait for unlock and then attempt to redraw all windows.

BUG=322728

Review URL: https://codereview.chromium.org/140453002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247059 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 44 insertions, 0 deletions

diff --git a/ui/base/win/lock_state.cc b/ui/base/win/lock_state.cc
new file mode 100644
index 0000000..c56eae4
--- /dev/null
+++ b/ui/base/win/lock_state.cc
@@ -0,0 +1,26 @@
+// Copyright 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
diff --git a/ui/base/win/lock_state.h b/ui/base/win/lock_state.h
new file mode 100644
index 0000000..be9c912
--- /dev/null
+++ b/ui/base/win/lock_state.h
@@ -0,0 +1,18 @@
+// Copyright 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.
+
+#ifndef UI_BASE_WIN_LOCK_STATE_H_
+#define UI_BASE_WIN_LOCK_STATE_H_
+
+#include "base/basictypes.h"
+#include "ui/base/ui_base_export.h"
+
+namespace ui {
+
+// Returns true if the screen is currently locked.
+UI_BASE_EXPORT bool IsWorkstationLocked();
+
+}  // namespace ui
+
+#endif  // UI_BASE_WIN_LOCK_STATE_H_