Creat a KeyboardEventManager class

third_party/WebKit/Source/platform/PlatformKeyboardEvent.cpp

 /*
  * Copyright (C) 2006, 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2008, 2009 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 53 matching lines @@
             // happen to be in this range, e.g. the Apple logo (Option+Shift+K).
             // 0xF7FF is an arbitrary cut-off.
             m_text = String();
             m_unmodifiedText = String();
         }
 #endif
     }
 #endif
 }
 
+PlatformEvent::Modifiers PlatformKeyboardEvent::accessKeyModifiers()
+{
+    // TODO(crbug.com/618397): Add a settings to control this behavior.
+#if OS(MACOSX)
+    return static_cast<PlatformEvent::Modifiers>(PlatformEvent::CtrlKey | PlatformEvent::AltKey);
+#else
+    return PlatformEvent::AltKey;
+#endif
+}
+
 bool PlatformKeyboardEvent::currentCapsLockState()
 {
     switch (s_overrideCapsLockState) {
     case OverrideCapsLockState::Default:
 #if OS(WIN)
             // FIXME: Does this even work inside the sandbox?
             return GetKeyState(VK_CAPITAL) & 1;
 #elif OS(MACOSX)
             return GetCurrentKeyModifiers() & alphaLock;
 #else
@@ skipping 29 matching lines @@
     if (currentModifiers & ::cmdKey)
         modifiers |= MetaKey;
 #else
     // TODO(crbug.com/538289): Implement on other platforms.
     return static_cast<Modifiers>(0);
 #endif
     return static_cast<Modifiers>(modifiers);
 }
 
 } // namespace blink