Make UI or API driven extension options navigations refocus any existing options page.

chrome/test/data/extensions/api_test/runtime/open_options_page/test.js

 // Copyright 2015 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.
 
 // browser_tests --gtest_filter=ExtensionApiTest.OpenOptionsPage
 
 var assertEq = chrome.test.assertEq;
+var assertTrue = chrome.test.assertTrue;
+var listenOnce = chrome.test.listenOnce;
+var pass = chrome.test.callbackPass;
 
-function test() {
-  chrome.test.listenOnce(chrome.runtime.onMessage, function(m, sender) {
-    assertEq('success', m);
-    assertEq(chrome.runtime.id, sender.id);
-    assertEq(chrome.runtime.getURL('options.html'), sender.url);
-  });
-  chrome.runtime.openOptionsPage();
+var optionsTabUrl = 'chrome://extensions/?options=' + chrome.runtime.id;
+
+// Finds the Tab for an options page, or null if no options page is open.
+// Asserts that there is at most 1 options page open.
+// Result is passed to |callback|.
+function findOptionsTab(callback) {
+  chrome.tabs.query({url: optionsTabUrl}, pass(function(tabs) {
+    assertTrue(tabs.length <= 1);
+    callback(tabs.length == 0 ? null : tabs[0]);
+  }));
 }
 
-chrome.test.runTests([test]);
+// Tests opening a new options page.
+function testNewOptionsPage() {
+  findOptionsTab(function(tab) {
+    assertEq(null, tab);
+    listenOnce(chrome.runtime.onMessage, function(m, sender) {
+      assertEq('success', m);
+      assertEq(chrome.runtime.id, sender.id);
+      assertEq(chrome.runtime.getURL('options.html'), sender.url);
+    });
+    chrome.runtime.openOptionsPage();
+  });
+}
+
+// Gets the active tab, or null if no tab is active. Asserts that there is at
+// most 1 active tab. Result is passed to |callback|.
+function getActiveTab(callback) {
+  chrome.tabs.query({active: true}, pass(function(tabs) {
+    assertTrue(tabs.length <= 1);
+    callback(tabs.length == 0 ? null : tabs[0]);
+  }));
+}
+
+// Tests refocusing an existing page.
+function testRefocusExistingOptionsPage() {
+  var testUrl = 'chrome://chrome/';
+
+  // There will already be an options page open from the last test. Find it,
+  // focus away from it, then make sure openOptionsPage() refocuses it.
+  findOptionsTab(function(optionsTab) {
+    assertTrue(optionsTab != null);
+    chrome.tabs.create({url: testUrl}, pass(function(tab) {
+      // Make sure the new tab is active.
+      getActiveTab(function(activeTab) {
+        assertEq(testUrl, activeTab.url);
+        // Open options page should refocus it.
+        chrome.runtime.openOptionsPage();
+        getActiveTab(function(activeTab) {
+          assertEq(optionsTabUrl, activeTab.url);
+        });
+      });
+    }));
+  });
+}
+
+chrome.test.runTests([testNewOptionsPage, testRefocusExistingOptionsPage]);