Allow WebUI Tests to use preLoad in HtmlDialogUI.

chrome/test/test_navigation_observer.h

-// 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.
-
-#ifndef CHROME_TEST_TEST_NAVIGATION_OBSERVER_H_
-#define CHROME_TEST_TEST_NAVIGATION_OBSERVER_H_
-#pragma once
-
-#include "base/compiler_specific.h"
-#include "base/memory/scoped_ptr.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
-
-class NavigationController;
-class RenderViewHost;
-
-// For browser_tests, which run on the UI thread, run a second
-// MessageLoop and quit when the navigation completes loading. For
-// WebUI tests that need to inject javascript, construct with a
-// JsInjectionReadyObserver and this class will call its
-// OnJsInjectionReady() at the appropriate time.
-class TestNavigationObserver : public content::NotificationObserver {
- public:
-  class RVHOSendJS;
-
-  // Interface to notify when JavaScript injection is possible.
-  class JsInjectionReadyObserver {
-   public:
-    JsInjectionReadyObserver();
-    virtual ~JsInjectionReadyObserver();
-
-    // Called to indicate page entry committed and ready for JavaScript
-    // injection.
-    virtual void OnJsInjectionReady(RenderViewHost* render_view_host) = 0;
-  };
-
-  // Create and register a new TestNavigationObserver against the
-  // |controller|. When |js_injection_ready_observer| is non-null, notify with
-  // OnEntryCommitted() after |number_of_navigations| navigations.
-  // Note: |js_injection_ready_observer| is owned by the caller and should be
-  // valid until this class is destroyed.
-  TestNavigationObserver(const content::NotificationSource& source,
-                         JsInjectionReadyObserver* js_injection_ready_observer,
-                         int number_of_navigations);
-
-  virtual ~TestNavigationObserver();
-
-  // Run the UI message loop until |done_| becomes true.
-  void WaitForObservation();
-
- protected:
-  // Note: |js_injection_ready_observer| is owned by the caller and should be
-  // valid until this class is destroyed. Subclasses using this constructor MUST
-  // call RegisterAsObserver when a NavigationController becomes available.
-  explicit TestNavigationObserver(
-      JsInjectionReadyObserver* js_injection_ready_observer,
-      int number_of_navigations);
-
-  // Register this TestNavigationObserver as an observer of the |source|.
-  void RegisterAsObserver(const content::NotificationSource& source);
-
- private:
-  // content::NotificationObserver:
-  virtual void Observe(int type, const content::NotificationSource& source,
-                       const content::NotificationDetails& details) OVERRIDE;
-
-  content::NotificationRegistrar registrar_;
-
-  // If true the navigation has started.
-  bool navigation_started_;
-
-  // The number of navigations that have been completed.
-  int navigations_completed_;
-
-  // The number of navigations to wait for.
-  int number_of_navigations_;
-
-  // Observer to take some action when the page is ready for JavaScript
-  // injection.
-  JsInjectionReadyObserver* js_injection_ready_observer_;
-
-  // |done_| will get set when this object observes a TabStripModel event.
-  bool done_;
-
-  // |running_| will be true during WaitForObservation until |done_| is true.
-  bool running_;
-
-  // |rvho_send_js_| will hold a RenderViewHostObserver subclass to allow
-  // JavaScript injection at the appropriate time.
-  scoped_ptr<RVHOSendJS> rvho_send_js_;
-
-  DISALLOW_COPY_AND_ASSIGN(TestNavigationObserver);
-};
-
-#endif  // CHROME_TEST_TEST_NAVIGATION_OBSERVER_H_