Adds testing infrastructure to web_ui_browsertest to support testing HtmlDialogs.

chrome/test/base/test_html_dialog_observer.cc

Index: chrome/test/base/test_html_dialog_observer.cc
diff --git a/chrome/test/base/test_html_dialog_observer.cc b/chrome/test/base/test_html_dialog_observer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..66a7fa8bc6b31b819f14f21c6085c47df9e3ddaf
--- /dev/null
+++ b/chrome/test/base/test_html_dialog_observer.cc
@@ -0,0 +1,69 @@
+// Copyright (c) 2011 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.
+
+#include "chrome/test/base/test_html_dialog_observer.h"
+
+#include "chrome/common/chrome_notification_types.h"
+#include "content/common/content_notification_types.h"
+#include "content/common/notification_details.h"
+#include "content/common/notification_service.h"
+#include "content/common/notification_source.h"
+#include "content/browser/tab_contents/navigation_controller.h"
+#include "content/browser/tab_contents/tab_contents.h"
+#include "content/browser/webui/web_ui.h"
+#include "chrome/test/base/ui_test_utils.h"
+
+TestHtmlDialogObserver::TestHtmlDialogObserver()
+    : web_ui_(NULL), done_(false), running_(false) {
+  registrar_.Add(this, chrome::NOTIFICATION_HTML_DIALOG_SHOWN,
+                 NotificationService::AllSources());
+}
+
+TestHtmlDialogObserver::~TestHtmlDialogObserver() {
+}
+
+void TestHtmlDialogObserver::Observe(int type,
+                                     const NotificationSource& source,
+                                     const NotificationDetails& details) {
+  switch (type) {
+    case chrome::NOTIFICATION_HTML_DIALOG_SHOWN:
+      web_ui_ = Source<WebUI>(source).ptr();
+      registrar_.Remove(this, chrome::NOTIFICATION_HTML_DIALOG_SHOWN,
+                        NotificationService::AllSources());
+      // Wait for navigation on the new WebUI instance to complete. This depends
+      // on receiving the notification of the HtmlDialog being shown before the
+      // NavigationController finishes loading. The HtmlDialog notification is
+      // issued from html_dialog_ui.cc on RenderView creation which results from
+      // the call to render_manager_.Navigate in the method
+      // TabContents::NavigateToEntry. The new RenderView is later told to
+      // navigate in this method, ensuring that this is not a race condition.
+      registrar_.Add(this, content::NOTIFICATION_LOAD_STOP,
+                     Source<NavigationController>(
+                         &web_ui_->tab_contents()->controller()));
+      break;
+    case content::NOTIFICATION_LOAD_STOP:
+      DCHECK(web_ui_);
+      registrar_.Remove(this, content::NOTIFICATION_LOAD_STOP,
+                        Source<NavigationController>(
+                            &web_ui_->tab_contents()->controller()));
+      done_ = true;
+      // If the message loop is running stop it.
+      if (running_) {
+        running_ = false;
+        MessageLoopForUI::current()->Quit();
+      }
+      break;
+    default:
+      NOTREACHED();
+  };
+}
+
+WebUI* TestHtmlDialogObserver::GetWebUI() {
+  if (!done_) {
+    EXPECT_FALSE(running_);
+    running_ = true;
+    ui_test_utils::RunMessageLoop();
+  }
+  return web_ui_;
+}