Allow showing pending URL for new tab navigations, but only if safe.

content/browser/renderer_host/render_view_host_impl.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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 253 matching lines @@
   // user decided the navigation should proceed should be passed as
   // |proceed_time|.
   void SetNavigationsSuspended(bool suspend,
                                const base::TimeTicks& proceed_time);
 
   // Clears any suspended navigation state after a cross-site navigation is
   // canceled or suspended.  This is important if we later return to this
   // RenderViewHost.
   void CancelSuspendedNavigations();
 
+  // Whether the initial empty page of this view has been accessed by another
+  // page, making it unsafe to show the pending URL.  Always false after the
+  // first commit.
+  bool has_accessed_initial_document() {
+    return has_accessed_initial_document_;
+  }
+
   // Whether this RenderViewHost has been swapped out to be displayed by a
   // different process.
   bool is_swapped_out() const { return is_swapped_out_; }
 
   // Tells the renderer that this RenderView is being swapped out for one in a
   // different renderer process.  It should run its unload handler and move to
   // a blank document.  The renderer should preserve the Frame object until it
   // exits, in case we come back.  The renderer can exit if it has no other
   // active RenderViews, but not until WasSwappedOut is called (when it is no
   // longer visible).
@@ skipping 265 matching lines @@
   void OnMediaNotification(int64 player_cookie,
                            bool has_video,
                            bool has_audio,
                            bool is_playing);
   void OnRequestDesktopNotificationPermission(const GURL& origin,
                                               int callback_id);
   void OnShowDesktopNotification(
       const ShowDesktopNotificationHostMsgParams& params);
   void OnCancelDesktopNotification(int notification_id);
   void OnRunFileChooser(const FileChooserParams& params);
+  void OnDidAccessInitialDocument();
   void OnDomOperationResponse(const std::string& json_string,
                               int automation_id);
   void OnFrameTreeUpdated(const std::string& frame_tree);
   void OnGetWindowSnapshot(const int snapshot_id);
 
 #if defined(OS_MACOSX) || defined(OS_ANDROID)
   void OnShowPopup(const ViewHostMsg_ShowPopup_Params& params);
 #endif
 
  private:
@@ skipping 33 matching lines @@
   // request, until we hear back from the onbeforeunload handler of the old
   // RenderViewHost.
   bool navigations_suspended_;
 
   // We only buffer the params for a suspended navigation while we have a
   // pending RVH for a WebContentsImpl.  There will only ever be one suspended
   // navigation, because WebContentsImpl will destroy the pending RVH and create
   // a new one if a second navigation occurs.
   scoped_ptr<ViewMsg_Navigate_Params> suspended_nav_params_;
 
+  // Whether the initial empty page of this view has been accessed by another
+  // page, making it unsafe to show the pending URL.  Usually false unless
+  // another window tries to modify the blank page.  Always false after the
+  // first commit.
+  bool has_accessed_initial_document_;
+
   // Whether this RenderViewHost is currently swapped out, such that the view is
   // being rendered by another process.
   bool is_swapped_out_;
 
   // Whether this RenderView is responsible for displaying a subframe in a
   // different process from its parent page.
   bool is_subframe_;
 
   // If we were asked to RunModal, then this will hold the reply_msg that we
   // must return to the renderer to unblock it.
@@ skipping 73 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(RenderViewHostImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_