Create a NavigationEntry for the initial blank page.

content/browser/frame_host/navigator_impl.cc

 // Copyright 2013 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 "content/browser/frame_host/navigator_impl.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/time/time.h"
 #include "content/browser/frame_host/frame_tree.h"
@@ skipping 313 matching lines @@
   // We can skip this step in the rare case that this is a transfer navigation
   // which began in the chosen RenderFrameHost, since the request has already
   // been issued.  In that case, simply resume the response.
   bool is_transfer_to_same =
       entry.transferred_global_request_id().child_id != -1 &&
       entry.transferred_global_request_id().child_id ==
           dest_render_frame_host->GetProcess()->GetID();
   if (!is_transfer_to_same) {
     navigation_data_.reset(new NavigationMetricsData(navigation_start, dest_url,
                                                      entry.restore_type()));
+
+    // The renderer expects the history length to be 0 for the initial page.
+    int history_offset = controller_->IsInitialNavigation() ? -1 :
+        controller_->GetLastCommittedEntryIndex();
+    int history_length = controller_->IsInitialNavigation() ? 0 :
+        controller_->GetEntryCount();
+
     // Create the navigation parameters.
     FrameMsg_Navigate_Type::Value navigation_type =
         GetNavigationType(controller_->GetBrowserContext(), entry, reload_type);
     dest_render_frame_host->Navigate(
         entry.ConstructCommonNavigationParams(dest_url, dest_referrer,
                                               frame_entry, navigation_type),
         entry.ConstructStartNavigationParams(),
         entry.ConstructRequestNavigationParams(
             frame_entry, navigation_start, is_same_document_history_load,
             frame_tree_node->has_committed_real_load(),
             controller_->GetPendingEntryIndex() == -1,
             controller_->GetIndexOfEntry(&entry),
-            controller_->GetLastCommittedEntryIndex(),
-            controller_->GetEntryCount()));
+            history_offset, history_length));
   } else {
     // No need to navigate again.  Just resume the deferred request.
     dest_render_frame_host->GetProcess()->ResumeDeferredNavigation(
         entry.transferred_global_request_id());
   }
 
   // Make sure no code called via RFH::Navigate clears the pending entry.
   CHECK_EQ(controller_->GetPendingEntry(), &entry);
 
   if (controller_->GetPendingEntryIndex() == -1 &&
@@ skipping 104 matching lines @@
   LoadCommittedDetails details;
   bool did_navigate = controller_->RendererDidNavigate(render_frame_host,
                                                        params, &details);
 
   // Keep track of each frame's URL in its FrameTreeNode.
   render_frame_host->frame_tree_node()->SetCurrentURL(params.url);
 
   // Send notification about committed provisional loads. This notification is
   // different from the NAV_ENTRY_COMMITTED notification which doesn't include
   // the actual URL navigated to and isn't sent for AUTO_SUBFRAME navigations.
-  if (details.type != NAVIGATION_TYPE_NAV_IGNORE && delegate_) {
+  // TODO(creis): Do we need to send this for AUTO_SUBFRAME when did_navigate
+  // is false?
+  if (delegate_) {
     DCHECK_EQ(!render_frame_host->GetParent(),
               did_navigate ? details.is_main_frame : false);
     ui::PageTransition transition_type = params.transition;
     // Whether or not a page transition was triggered by going backward or
     // forward in the history is only stored in the navigation controller's
     // entry list.
     if (did_navigate &&
         (controller_->GetLastCommittedEntry()->GetTransitionType() &
             ui::PAGE_TRANSITION_FORWARD_BACK)) {
       transition_type = ui::PageTransitionFromInt(
@@ skipping 463 matching lines @@
       entry->set_should_replace_entry(pending_entry->should_replace_entry());
       entry->SetRedirectChain(pending_entry->GetRedirectChain());
     }
     controller_->SetPendingEntry(entry.Pass());
     if (delegate_)
       delegate_->NotifyChangedNavigationState(content::INVALIDATE_TYPE_URL);
   }
 }
 
 }  // namespace content