[ContextMenu] Shift+F10 should trigger contextmenu on keydown to match system behavior

third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 1052 matching lines @@
             // Suppress the next keypress event unless the focused node is a plugin node.
             // (Flash needs these keypress events to handle non-US keyboards.)
             Element* element = focusedElement();
             if (!element || !element->layoutObject() || !element->layoutObject()->isEmbeddedObject())
                 m_suppressNextKeypressEvent = true;
         }
         return result;
     }
 
 #if !OS(MACOSX)
-    const WebInputEvent::Type contextMenuTriggeringEventType =
+    const WebInputEvent::Type contextMenuKeyTriggeringEventType =
 #if OS(WIN)
         WebInputEvent::KeyUp;
 #else
         WebInputEvent::RawKeyDown;
 #endif
+    const WebInputEvent::Type shiftF10TriggeringEventType = WebInputEvent::RawKeyDown;
 
     bool isUnmodifiedMenuKey = !(event.modifiers & WebInputEvent::InputModifiers) && event.windowsKeyCode == VKEY_APPS;
     bool isShiftF10 = (event.modifiers & WebInputEvent::InputModifiers) == WebInputEvent::ShiftKey && event.windowsKeyCode == VKEY_F10;
-    if ((isUnmodifiedMenuKey || isShiftF10) && event.type == contextMenuTriggeringEventType) {
+    if ((isUnmodifiedMenuKey && event.type == contextMenuKeyTriggeringEventType)
+        || (isShiftF10 && event.type == shiftF10TriggeringEventType)) {
         view()->sendContextMenuEvent(event);
         return WebInputEventResult::HandledSystem;
     }
 #endif // !OS(MACOSX)
 
     return keyEventDefault(event);
 }
 
 WebInputEventResult WebFrameWidgetImpl::handleCharEvent(const WebKeyboardEvent& event)
 {
@@ skipping 362 matching lines @@
 }
 
 LocalFrame* WebFrameWidgetImpl::focusedLocalFrameAvailableForIme() const
 {
     if (!m_imeAcceptEvents)
         return nullptr;
     return focusedLocalFrameInWidget();
 }
 
 } // namespace blink