Allow Control+Shift+Q on lock screen.

ash/accelerators/accelerator_table.cc

 // Copyright (c) 2012 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 "ash/accelerators/accelerator_table.h"
 
 #include "base/basictypes.h"
 #include "ui/base/events.h"
 
 namespace ash {
@@ skipping 110 matching lines @@
   { true, ui::VKEY_W, ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN, CYCLE_BACKWARD_MRU },
   { true, ui::VKEY_F4, ui::EF_CONTROL_DOWN, MONITOR_ADD_REMOVE },
   { true, ui::VKEY_F4, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN, MONITOR_CYCLE },
   { true, ui::VKEY_HOME, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN,
     MONITOR_TOGGLE_SCALE },
 #endif
 };
 
 const size_t kAcceleratorDataLength = arraysize(kAcceleratorData);
 
-const AcceleratorAction kActionsAllowedAtLoginScreen[] = {
+const AcceleratorAction kActionsAllowedAtLoginOrLockScreen[] = {
   BRIGHTNESS_DOWN,
   BRIGHTNESS_UP,
   NEXT_IME,
   PREVIOUS_IME,
   SWITCH_IME,  // Switch to another IME depending on the accelerator.
   TAKE_SCREENSHOT,
   TAKE_PARTIAL_SCREENSHOT,
   TOGGLE_CAPS_LOCK,
   TOGGLE_SPOKEN_FEEDBACK,
   VOLUME_DOWN,
   VOLUME_MUTE,
   VOLUME_UP,
   ROTATE_WINDOWS,
 #if !defined(NDEBUG)
   PRINT_LAYER_HIERARCHY,
   PRINT_WINDOW_HIERARCHY,
   ROTATE_SCREEN,
 #endif
 };
 
-const size_t kActionsAllowedAtLoginScreenLength =
-    arraysize(kActionsAllowedAtLoginScreen);
+const size_t kActionsAllowedAtLoginOrLockScreenLength =
+    arraysize(kActionsAllowedAtLoginOrLockScreen);
+
+const AcceleratorAction kActionsAllowedAtLockScreen[] = {
+  EXIT,
+};
+
+const size_t kActionsAllowedAtLockScreenLength =
+    arraysize(kActionsAllowedAtLockScreen);
 
 }  // namespace ash