<webview>: Add test coverage for deferred newwindow attachment.

chrome/browser/apps/web_view_interactive_browsertest.cc

Index: chrome/browser/apps/web_view_interactive_browsertest.cc
diff --git a/chrome/browser/apps/web_view_interactive_browsertest.cc b/chrome/browser/apps/web_view_interactive_browsertest.cc
index f697b4d0fc33442acfa0e2c97bf0d61707612ab6..90f9d7c0619c237ac5a996b324131a3778c5fce0 100644
--- a/chrome/browser/apps/web_view_interactive_browsertest.cc
+++ b/chrome/browser/apps/web_view_interactive_browsertest.cc
@@ -763,6 +763,12 @@ IN_PROC_BROWSER_TEST_F(WebViewInteractiveTest, NewWindow_Close) {
              NEEDS_TEST_SERVER);
 }
 
+IN_PROC_BROWSER_TEST_F(WebViewInteractiveTest, NewWindow_DeferredAttachment) {
+  TestHelper("testNewWindowDeferredAttachment",
+             "web_view/newwindow",
+             NEEDS_TEST_SERVER);
+}
+
 IN_PROC_BROWSER_TEST_F(WebViewInteractiveTest, NewWindow_ExecuteScript) {
   TestHelper("testNewWindowExecuteScript",
              "web_view/newwindow",