Bug 647886 - Pulling down Back/Forward menu requires an unnecessary delay. r=sdwilsh

browser/base/content/test/Makefile.in

@@ -170,6 +170,7 @@ _BROWSER_FILES = \
                  browser_bug616836.js \
                  browser_bug623893.js \
                  browser_bug624734.js \
+                 browser_bug647886.js \
                  browser_findbarClose.js \
                  browser_contextSearchTabPosition.js \
                  browser_ctrlTab.js \

browser/base/content/test/browser_bug647886.js

@@ -0,0 +1,34 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  waitForExplicitFinish();
+
+  gBrowser.selectedBrowser.addEventListener("load", function () {
+    gBrowser.selectedBrowser.removeEventListener("load", arguments.callee, true);
+
+    content.history.pushState({}, "2", "2.html");
+
+    testBackButton();
+  }, true);
+
+  loadURI("http://example.com");
+}
+
+function testBackButton() {
+  var backButton = document.getElementById("back-button");
+  var rect = backButton.getBoundingClientRect();
+
+  info("waiting for the history menu to open");
+
+  backButton.addEventListener("popupshown", function (event) {
+    backButton.removeEventListener("popupshown", arguments.callee, false);
+
+    ok(true, "history menu opened");
+    event.target.hidePopup();
+    finish();
+  }, false);
+
+  EventUtils.synthesizeMouseAtCenter(backButton, {type: "mousedown"});
+  EventUtils.synthesizeMouse(backButton, rect.width / 2, rect.height, {type: "mouseup"});
+}