[Events] Propagate IME composition event to JS on Android.

Source/core/events/KeyboardEvent.cpp

 /**
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2001 Tobias Anton (anton@stud.fbi.fh-darmstadt.de)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 145 matching lines @@
     return false;
 }
 
 int KeyboardEvent::keyCode() const
 {
     // IE: virtual key code for keyup/keydown, character code for keypress
     // Firefox: virtual key code for keyup/keydown, zero for keypress
     // We match IE.
     if (!m_keyEvent)
         return 0;
+
+#if OS(ANDROID)
+    // FIXME: Check to see if this applies to other OS.
+    // If the key event belongs to IME composition then propagate to JS.
+    if (m_keyEvent->nativeVirtualKeyCode() == 0xE5) // VKEY_PROCESSKEY
+        return m_keyEvent->nativeVirtualKeyCode();
+#endif
+
     if (type() == EventTypeNames::keydown || type() == EventTypeNames::keyup)
         return windowsVirtualKeyCodeWithoutLocation(m_keyEvent->windowsVirtualKeyCode());
 
     return charCode();
 }
 
 int KeyboardEvent::charCode() const
 {
     // IE: not supported
     // Firefox: 0 for keydown/keyup events, character code for keypress
@@ skipping 37 matching lines @@
 {
 }
 
 bool KeyboardEventDispatchMediator::dispatchEvent(EventDispatcher& dispatcher) const
 {
     // Make sure not to return true if we already took default action while handling the event.
     return EventDispatchMediator::dispatchEvent(dispatcher) && !event().defaultHandled();
 }
 
 } // namespace blink