Start sending auxclick instead of click for non-primary buttons

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

Index: third_party/WebKit/Source/devtools/front_end/devtools.js
diff --git a/third_party/WebKit/Source/devtools/front_end/devtools.js b/third_party/WebKit/Source/devtools/front_end/devtools.js
index 5e83ae3bb1ca36b38dfeedb22024902029e551ba..c831db8b7fe72a590489c17ec406489d72a03736 100644
--- a/third_party/WebKit/Source/devtools/front_end/devtools.js
+++ b/third_party/WebKit/Source/devtools/front_end/devtools.js
@@ -1088,6 +1088,20 @@ function installBackwardsCompatibility()
     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", {