When simulating a navigation via TestRenderViewHost, first start a provisional load before committin

chrome/browser/extensions/api/web_navigation/web_navigation_api.h

 // Copyright (c) 2012 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.
 
 // Defines the Chrome Extensions WebNavigation API functions for observing and
 // intercepting navigation events, as specified in the extension JSON API.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_WEB_NAVIGATION_WEB_NAVIGATION_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_WEB_NAVIGATION_WEB_NAVIGATION_API_H_
 
@@ skipping 76 matching lines @@
   // True if the transition and target url correspond to a reference fragment
   // navigation.
   bool IsReferenceFragmentNavigation(int64 frame_id, const GURL& url);
 
   // Tracks the state of the frames we are sending events for.
   FrameNavigationState navigation_state_;
 
   // Used for tracking registrations to redirect notifications.
   content::NotificationRegistrar registrar_;
 
+  content::RenderViewHost* render_view_host_;
+  content::RenderViewHost* pending_render_view_host_;
+
   DISALLOW_COPY_AND_ASSIGN(WebNavigationTabObserver);
 };
 
 // Observes navigation notifications and routes them as events to the extension
 // system.
 class WebNavigationEventRouter : public TabStripModelObserver,
                                  public chrome::BrowserListObserver,
                                  public content::NotificationObserver {
  public:
   explicit WebNavigationEventRouter(Profile* profile);
@@ skipping 72 matching lines @@
 // API function that returns the states of all frames in a given tab.
 class GetAllFramesFunction : public SyncExtensionFunction {
   virtual ~GetAllFramesFunction() {}
   virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("webNavigation.getAllFrames")
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_WEB_NAVIGATION_WEB_NAVIGATION_API_H_