Classify navigations without page id in parallel to the existing classifier.

content/public/renderer/navigation_state.h

Index: content/public/renderer/navigation_state.h
diff --git a/content/public/renderer/navigation_state.h b/content/public/renderer/navigation_state.h
index 15eac2663e6734526f91ddff74edae364481d341..9d8cd142950f14e206166f66a95b0fce49b00a9c 100644
--- a/content/public/renderer/navigation_state.h
+++ b/content/public/renderer/navigation_state.h
@@ -21,24 +21,32 @@ class CONTENT_EXPORT NavigationState {
 
   static NavigationState* CreateBrowserInitiated(
       int32 pending_page_id,
+      int pending_nav_entry_id,
       int pending_history_list_offset,
       bool history_list_was_cleared,
       ui::PageTransition transition_type) {
     return new NavigationState(transition_type,
                                false,
                                pending_page_id,
+                               pending_nav_entry_id,
                                pending_history_list_offset,
                                history_list_was_cleared);
   }
 
   static NavigationState* CreateContentInitiated() {
     return new NavigationState(
-        ui::PAGE_TRANSITION_LINK, true, -1, -1, false);
+        ui::PAGE_TRANSITION_LINK, true, -1, 0, -1, false);
   }
 
   // Contains the page_id for this navigation or -1 if there is none yet.
   int32 pending_page_id() const { return pending_page_id_; }
 
+  // Contains the nav_entry_id for this navigation if it is browser-initiated,
+  // or 0 if there is none because it was renderer-initiated.
+  int32 pending_nav_entry_id() const {
+    return pending_nav_entry_id_;
+  }
+
   // If pending_page_id() is not -1, then this contains the corresponding
   // offset of the page in the back/forward history list.
   int pending_history_list_offset() const {
@@ -119,6 +127,7 @@ class CONTENT_EXPORT NavigationState {
   NavigationState(ui::PageTransition transition_type,
                   bool is_content_initiated,
                   int32 pending_page_id,
+                  int pending_nav_entry_id,
                   int pending_history_list_offset,
                   bool history_list_was_cleared);
 
@@ -126,6 +135,7 @@ class CONTENT_EXPORT NavigationState {
   bool request_committed_;
   bool is_content_initiated_;
   int32 pending_page_id_;
+  int pending_nav_entry_id_;
   int pending_history_list_offset_;
   bool history_list_was_cleared_;
   bool should_replace_current_entry_;