Add the ability to focus a window to chrome.window.update().

chrome/test/data/extensions/api_test/tabs/basics/test.js

 // tabs api test
 // browser_tests.exe --gtest_filter=ExtensionApiTest.Tabs
 
 // We have a bunch of places where we need to remember some state from one
 // test (or setup code) to subsequent tests.
 var firstWindowId = null;
 var secondWindowId = null;
 var firstTabIndex = null;
 var testTabId = null;
 
@@ skipping 17 matching lines @@
       firstTabIndex = tab.index;
     }));
   },
 
   function create() {
     chrome.tabs.create({"windowId" : firstWindowId, "selected" : false},
                        pass(function(tab){
       assertTrue(tab.index > firstTabIndex);
       assertEq(firstWindowId, tab.windowId);
       assertEq(false, tab.selected);
-      assertEq("chrome://newtab/", tab.url);
     }));
   },
 
   function createInOtherWindow() {
     chrome.windows.create({}, pass(function(win) {
       // The newly created window is now the currentWindow.
       // Create a tab in the older window.
       chrome.tabs.create({"windowId" : firstWindowId, "selected" : false},
                          pass(function(tab) {
         assertEq(firstWindowId, tab.windowId);
@@ skipping 185 matching lines @@
     chrome.tabs.remove(moveTabIds["d"], pass(function() {
       chrome.tabs.getAllInWindow(secondWindowId,
                                  pass(function(tabs) {
         assertEq(2, tabs.length);
         assertEq(pageUrl("b"), tabs[0].url);
         assertEq("chrome://newtab/", tabs[1].url);
       }));
     }));
   },
 
+  function focus() {
+    chrome.test.listenOnce(chrome.windows.onFocusChanged, function(winId) {
+      assertEq(firstWindowId, winId);
+    });
+
+    chrome.windows.update(firstWindowId, {focused: true}, pass());
+  },
+
   /*
   // TODO(jcampan): http://crbug.com/30662 the detection language library
   //                crashes on some sites and has been temporarily disabled.
   function detectLanguage() {
     chrome.tabs.getAllInWindow(firstWindowId, pass(function(tabs) {
       chrome.tabs.detectLanguage(tabs[0].id, pass(function(lang) {
         assertEq("en", lang);
       }));
     }));
   },
@@ skipping 316 matching lines @@
     var request = "test";
     chrome.tabs.sendRequest(testTabId, request, pass(function(response) {
       assertEq(request, response);
     }));
   },
 
   // TODO(asargent)
   // It would be an improvement to check the captureVisibleTab results
   // against a known-good result.
 ]);