Add frame_tree_node_id to navigation parameters.

content/browser/frame_host/navigation_entry_impl.h

 // 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.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_NAVIGATION_ENTRY_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_ENTRY_IMPL_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "content/browser/site_instance_impl.h"
@@ skipping 198 matching lines @@
 
   // Whether this (pending) navigation should clear the session history. Resets
   // to false after commit.
   bool should_clear_history_list() const {
     return should_clear_history_list_;
   }
   void set_should_clear_history_list(bool should_clear_history_list) {
     should_clear_history_list_ = should_clear_history_list;
   }
 
+  // Indicates which FrameTreeNode to navigate.  Currently only used if the
+  // --site-per-process flag is passed.
+  int64 frame_tree_node_id() const {
+    return frame_tree_node_id_;
+  }
+  void set_frame_tree_node_id(int64 frame_tree_node_id) {
+    frame_tree_node_id_ = frame_tree_node_id;
+  }
+
  private:
   // WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
   // Session/Tab restore save portions of this class so that it can be recreated
   // later. If you add a new field that needs to be persisted you'll have to
   // update SessionService/TabRestoreService and Android WebView
   // state_serializer.cc appropriately.
   // WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
 
   // See the accessors above for descriptions.
   int unique_id_;
@@ skipping 87 matching lines @@
   bool should_clear_history_list_;
 
   // Set when this entry should be able to access local file:// resources. This
   // value is not needed after the entry commits and is not persisted.
   bool can_load_local_resources_;
 
   // If not empty, the name of the frame to navigate. This field is not
   // persisted, because it is currently only used in tests.
   std::string frame_to_navigate_;
 
+  // If not -1, this indicates which FrameTreeNode to navigate.  This field is
+  // not persisted because it is experimental and only used when the
+  // --site-per-process flag is passed.  It is cleared in |ResetForCommit|
+  // because we only use it while the navigation is pending.
+  // TODO(creis): Move this to FrameNavigationEntry.
+  int64 frame_tree_node_id_;
+
   // Used to store extra data to support browser features. This member is not
   // persisted, unless specific data is taken out/put back in at save/restore
   // time (see TabNavigation for an example of this).
   std::map<std::string, string16> extra_data_;
 
   // Copy and assignment is explicitly allowed for this class.
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_ENTRY_IMPL_H_