Start sending auxclick instead of click for non-primary buttons

third_party/WebKit/Source/devtools/front_end/devtools.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /* eslint-disable indent */
 (function(window) {
 
 // DevToolsAPI ----------------------------------------------------------------
 
 /**
@@ skipping 1070 matching lines @@
  * @suppressGlobalPropertiesCheck
  * @suppress {checkTypes}
  */
 function installBackwardsCompatibility()
 {
     sanitizeRemoteFrontendUrl();
 
     if (window.location.search.indexOf("remoteFrontend") === -1)
         return;
 
+    // Support for legacy (<M54) frontends.
+    if (window.hasOwnProperty("onauxclick") && !window["InspectorFrontendAPI"].hasOwnProperty("onauxclick")) {

[dgozman, 2016/08/03 20:54:28]

This detection won't work: the hosting Chrome browser either has auxclick or
not. All the code is executed in the same browser, so this should be always
false.

[Navid Zolghadr, 2016/08/03 21:35:20]

I tested this and this did cause my remote devtools (tab closing with middle
click) work there.  But anyways, as per your other comment I'm going to remove
it in the next patch.

+        document.addEventListener("auxclick", function(e) {
+            let target = e.target;
+            if (target.shadowRoot)
+                target = target.shadowRoot.activeElement;
+            if (e.button !== 0) {
+                 target.dispatchEvent(new MouseEvent("click", e));
+                 if (e.detail === 2)
+                     target.dispatchEvent(new MouseEvent("dblclick", e));
+            }
+        }, true);
+    }
+
     // Support for legacy (<M53) frontends.
     if (!window.KeyboardEvent.prototype.hasOwnProperty("keyIdentifier")) {
         Object.defineProperty(window.KeyboardEvent.prototype, "keyIdentifier", {
             get: function()
             {
                 return keyCodeToKeyIdentifier(this.keyCode);
             }
         });
     }
 
@@ skipping 68 matching lines @@
 
 if (!DOMTokenList.prototype.__originalDOMTokenListToggle) {
     DOMTokenList.prototype.__originalDOMTokenListToggle = DOMTokenList.prototype.toggle;
     DOMTokenList.prototype.toggle = function(token, force)
     {
         if (arguments.length === 1)
             force = !this.contains(token);
         return this.__originalDOMTokenListToggle(token, !!force);
     }
 }