Add the feature to retain the user gesture in the extension callback

chrome/test/data/extensions/api_test/permissions/optional_retain_gesture/background.js

+// Copyright (c) 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.
+
+var fail = chrome.test.callbackFail;
+
+var GESTURE_ERROR = "This function must be called during a user gesture";
+
+function busyLoop(milliseconds) {
+  var startTime = new Date().getTime();
+  while (new Date().getTime() - startTime < milliseconds) {}
+}
+
+chrome.test.getConfig(function(config) {
+  chrome.test.runTests([
+    function testPermissionsRetainGesture() {
+      chrome.test.runWithUserGesture(function() {
+        chrome.permissions.request(
+            {permissions: ['bookmarks']},
+            function(granted) {
+              chrome.test.assertTrue(granted);
+
+              // The user gesture is retained, so we can request again.
+              chrome.permissions.request(
+                  {permissions: ['bookmarks']},
+                  function(granted) {
+                    chrome.test.assertTrue(granted);
+
+                    // The user gesture is retained but is consumed outside,
+                    // so the following request will fail.
+                    chrome.permissions.request(
+                        {permissions: ['bookmarks']},
+                        fail(GESTURE_ERROR));
+                  }
+              );
+
+              // Consume the user gesture
+              window.open("", "", "");
+            }
+        );
+      });
+    },
+
+    function testPermissionsRetainGestureExpire() {
+      chrome.test.runWithUserGesture(function() {
+        chrome.permissions.request(
+            {permissions: ['bookmarks']},
+            function(granted) {
+              chrome.test.assertTrue(granted);
+
+              var request = function() {
+                // The following request will fail if the user gesture is
+                // expired.
+                chrome.permissions.request(
+                    {permissions: ['bookmarks']},
+                    function(granted1) {
+                      if (chrome.runtime.lastError) {
+                        chrome.test.assertFalse(granted1);
+                        chrome.test.assertEq(chrome.runtime.lastError.message,
+                                             GESTURE_ERROR);
+                        chrome.test.succeed();
+                      } else {
+                        console.log("Retrying permissions.request in 3 " +
+                            "seconds");
+                        busyLoop(3000);
+                        request();
+                      }
+                    });
+              };
+
+              // Wait 2s since the user gesture timeout is 1s.
+              busyLoop(2000);
+              request();
+            }
+        );
+      });
+    }
+  ]);
+});