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

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

Index: chrome/test/data/extensions/api_test/tabs/basics/test.js
diff --git a/chrome/test/data/extensions/api_test/tabs/basics/test.js b/chrome/test/data/extensions/api_test/tabs/basics/test.js
index a516ddc26e667731e532d1d56fa64716e1fa5148..00f20dd14c6f5d23fff5eda2ee02d50019deacad 100644
--- a/chrome/test/data/extensions/api_test/tabs/basics/test.js
+++ b/chrome/test/data/extensions/api_test/tabs/basics/test.js
@@ -35,7 +35,6 @@ chrome.test.runTests([
       assertTrue(tab.index > firstTabIndex);
       assertEq(firstWindowId, tab.windowId);
       assertEq(false, tab.selected);
-      assertEq("chrome://newtab/", tab.url);
     }));
   },
 
@@ -241,6 +240,14 @@ chrome.test.runTests([
     }));
   },
 
+  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.