Add pyauto tests for the New Tab page.

chrome/test/pyautolib/pyautolib.i

Index: chrome/test/pyautolib/pyautolib.i
diff --git a/chrome/test/pyautolib/pyautolib.i b/chrome/test/pyautolib/pyautolib.i
index f228a88da6dc311e92f37edc939042533d9715f6..3a88b131e89060dddf7c6e0cacff8230f3783439 100644
--- a/chrome/test/pyautolib/pyautolib.i
+++ b/chrome/test/pyautolib/pyautolib.i
@@ -302,6 +302,9 @@ class PyUITestBase {
   %feature("docstring", "Open a new browser window.") OpenNewBrowserWindow;
   bool OpenNewBrowserWindow(bool show);
 
+  %feature("docstring", "Close a browser window.") CloseBrowserWindow;
+  bool CloseBrowserWindow(int window_index);
+
   %feature("docstring", "Fetch the number of browser windows. Includes popups.")
       GetBrowserWindowCount;
   int GetBrowserWindowCount();