Avoid toggling app list if interrupted by mouse

ash/accelerators/accelerator_controller.cc

Index: ash/accelerators/accelerator_controller.cc
diff --git a/ash/accelerators/accelerator_controller.cc b/ash/accelerators/accelerator_controller.cc
index cff2bbf0d451c44d5bda21b1c828b58e641bfd1a..50a8dbc0729ed88b95b51dbe21a475c84d341cc4 100644
--- a/ash/accelerators/accelerator_controller.cc
+++ b/ash/accelerators/accelerator_controller.cc
@@ -393,7 +393,8 @@ bool CanHandleToggleAppList(const ui::Accelerator& accelerator,
     // Search key.
     if (previous_accelerator.key_state() !=
             ui::Accelerator::KeyState::PRESSED ||
-        previous_accelerator.key_code() != ui::VKEY_LWIN) {
+        previous_accelerator.key_code() != ui::VKEY_LWIN ||
+        previous_accelerator.is_interrupted_by_mouse_event()) {
       return false;
     }