Dispatch middle click manually by tracking mouse

chrome/browser/resources/ntp4/synthetic_middleclick.js

Index: chrome/browser/resources/ntp4/synthetic_middleclick.js
diff --git a/chrome/browser/resources/ntp4/synthetic_middleclick.js b/chrome/browser/resources/ntp4/synthetic_middleclick.js
new file mode 100644
index 0000000000000000000000000000000000000000..6981fec1ded0cf85babb1807d83e9883dac1be4b
--- /dev/null
+++ b/chrome/browser/resources/ntp4/synthetic_middleclick.js
@@ -0,0 +1,18 @@
+// Copyright 2016 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.
+
+(function() {

[Dan Beam, 2016/05/24 18:17:25]

\n are well worth the bytes

(function() {

var middleButtonMouseDownTarget = null;

document.addEventListener('mousedown', function(e) {
  if (e.button == 1)
    middleButtonMouseDownTarget = e.path[0];
});

document.addEventListener('mouseup', function(e) {
  if (e.button != 1)
    return;

  if (e.path[0] === middleButtonMouseDownTarget)
    middleButtonMouseDownTarget.dispatchEvent(new MouseEvent('click', e));

  middleButtonMouseDownTarget = null;
});

})();

[Navid Zolghadr, 2016/05/24 18:38:23]

Sure. Done.

+var middleButtonMouseDownTarget = null;
+document.addEventListener('mousedown', function(e) {
+  if (e.button == 1)
+    middleButtonMouseDownTarget = e.path[0];
+}, true);
+document.addEventListener('mouseup', function(e) {
+  if (e.button == 1) {
+    if (e.path[0] == middleButtonMouseDownTarget)
+      e.path[0].dispatchEvent(new MouseEvent('click', e));
+    middleButtonMouseDownTarget = null;
+  }
+}, true);
+})();