Start sending auxclick instead of click for non-primary buttons

third_party/WebKit/Source/core/dom/GlobalEventHandlers.idl

 /*
  * Copyright (c) 2013, Opera Software ASA. 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 78 matching lines @@
     attribute EventHandler onshow;
     //attribute EventHandler onsort;
     attribute EventHandler onstalled;
     attribute EventHandler onsubmit;
     attribute EventHandler onsuspend;
     attribute EventHandler ontimeupdate;
     attribute EventHandler ontoggle;
     attribute EventHandler onvolumechange;
     attribute EventHandler onwaiting;
 
+    // auxclick
+    // https://navidz.github.io/auxclick/
+    [RuntimeEnabled=Auxclick] attribute EventHandler onauxclick;
+
     // Pointer Events
     // https://w3c.github.io/pointerevents/#extensions-to-the-globaleventhandlers-interface
     [RuntimeEnabled=PointerEvent] attribute EventHandler onpointerdown;
     [RuntimeEnabled=PointerEvent] attribute EventHandler onpointermove;
     [RuntimeEnabled=PointerEvent] attribute EventHandler onpointerup;
     [RuntimeEnabled=PointerEvent] attribute EventHandler onpointercancel;
     [RuntimeEnabled=PointerEvent] attribute EventHandler onpointerover;
     [RuntimeEnabled=PointerEvent] attribute EventHandler onpointerout;
     [RuntimeEnabled=PointerEvent] attribute EventHandler onpointerenter;
     [RuntimeEnabled=PointerEvent] attribute EventHandler onpointerleave;
 
     // Touch Events
     // https://w3c.github.io/touch-events/#extensions-to-the-globaleventhandlers-interface
     [RuntimeEnabled=Touch] attribute EventHandler ontouchcancel;
     [RuntimeEnabled=Touch] attribute EventHandler ontouchend;
     [RuntimeEnabled=Touch] attribute EventHandler ontouchmove;
     [RuntimeEnabled=Touch] attribute EventHandler ontouchstart;
 };