Added key binding for the overtype mode

Source/WebKit/chromium/src/EditorClientImpl.cpp

 /*
  * Copyright (C) 2006, 2007 Apple, Inc.  All rights reserved.
  * Copyright (C) 2012 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:
  * 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 441 matching lines @@
     // blinking.
     { 'C',         CtrlKey,            "Copy"                                 },
     { 'V',         CtrlKey,            "Paste"                                },
     { 'V',         CtrlKey | ShiftKey, "PasteAndMatchStyle"                   },
     { 'X',         CtrlKey,            "Cut"                                  },
     { 'A',         CtrlKey,            "SelectAll"                            },
     { 'Z',         CtrlKey,            "Undo"                                 },
     { 'Z',         CtrlKey | ShiftKey, "Redo"                                 },
     { 'Y',         CtrlKey,            "Redo"                                 },
 #endif
+    { VKEY_INSERT, 0,                  "OverWrite"                            },
 };
 
 static const KeyPressEntry keyPressEntries[] = {
     { '\t',   0,                  "InsertTab"                                 },
     { '\t',   ShiftKey,           "InsertBacktab"                             },
     { '\r',   0,                  "InsertNewline"                             },
     { '\r',   CtrlKey,            "InsertNewline"                             },
     { '\r',   ShiftKey,           "InsertLineBreak"                           },
     { '\r',   AltKey,             "InsertNewline"                             },
     { '\r',   AltKey | ShiftKey,  "InsertNewline"                             },
@@ skipping 288 matching lines @@
 #endif
 }
 
 void EditorClientImpl::willSetInputMethodState()
 {
     if (m_webView->client())
         m_webView->client()->resetInputMethod();
 }
 
 } // namesace WebKit