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 b5145db4214fc56529e3d7fd67505f7cdbd7f793..452df17fa2a1099cfabd84f0adad1daf1e604bf1 100644
--- a/ash/accelerators/accelerator_controller.cc
+++ b/ash/accelerators/accelerator_controller.cc
@@ -378,7 +378,8 @@ 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.interrupted_by_mouse_event()) {
       return false;
     }