Don't handle the key events with Command (Search) modifier by IME.

chrome/browser/ui/input_method/input_method_engine_base.cc

 // Copyright 2016 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 "chrome/browser/ui/input_method/input_method_engine_base.h"
 
 #include <memory>
 
 #undef FocusIn
 #undef FocusOut
@@ skipping 344 matching lines @@
 bool InputMethodEngineBase::IsInterestedInKeyEvent() const {
   return observer_->IsInterestedInKeyEvent();
 }
 
 void InputMethodEngineBase::ProcessKeyEvent(const ui::KeyEvent& key_event,
                                             KeyEventDoneCallback& callback) {
   // Make true that we don't handle IME API calling of setComposition and
   // commitText while the extension is handling key event.
   handling_key_event_ = true;
 
+  if (key_event.IsCommandDown()) {
+    callback.Run(false);
+    return;
+  }
+
   KeyboardEvent ext_event;
   GetExtensionKeyboardEventFromKeyEvent(key_event, &ext_event);
 
   // If the given key event is equal to the key event sent by
   // SendKeyEvents, this engine ID is propagated to the extension IME.
   // Note, this check relies on that ui::KeyEvent is propagated as
   // reference without copying.
   if (&key_event == sent_key_event_)
     ext_event.extension_id = extension_id_;
 
@@ skipping 84 matching lines @@
         ui::EventTimeForNow());
     base::AutoReset<const ui::KeyEvent*> reset_sent_key(&sent_key_event_,
                                                         &ui_event);
     if (!SendKeyEvent(&ui_event, event.code))
       return false;
   }
   return true;
 }
 
 }  // namespace input_method