[Sync] Add per-navigation timestamps/unique ids to tab sync.

chrome/browser/sync/profile_sync_service_session_unittest.cc

 // 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.
 
 #include <map>
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
@@ skipping 79 matching lines @@
 void BuildTabSpecifics(const std::string& tag, int window_id, int tab_id,
                      sync_pb::SessionSpecifics* tab_base) {
   tab_base->set_session_tag(tag);
   sync_pb::SessionTab* tab = tab_base->mutable_tab();
   tab->set_tab_id(tab_id);
   tab->set_tab_visual_index(1);
   tab->set_current_navigation_index(0);
   tab->set_pinned(true);
   tab->set_extension_app_id("app_id");
   sync_pb::TabNavigation* navigation = tab->add_navigation();
-  navigation->set_index(12);
   navigation->set_virtual_url("http://foo/1");
   navigation->set_referrer("referrer");
   navigation->set_title("title");
   navigation->set_page_transition(sync_pb::TabNavigation_PageTransition_TYPED);
 }
 
 // Verifies number of windows, number of tabs, and basic fields.
 void VerifySyncedSession(
     const std::string& tag,
     const std::vector<std::vector<SessionID::id_type> >& windows,
@@ skipping 22 matching lines @@
     for (std::vector<int>::const_iterator tab_iter = (*win_iter).begin();
          tab_iter != (*win_iter).end(); ++tab_iter, ++j) {
       SessionTab* tab = win_ptr->tabs[j];
       ASSERT_EQ(*tab_iter, tab->tab_id.id());
       ASSERT_EQ(1U, tab->navigations.size());
       ASSERT_EQ(1, tab->tab_visual_index);
       ASSERT_EQ(0, tab->current_navigation_index);
       ASSERT_TRUE(tab->pinned);
       ASSERT_EQ("app_id", tab->extension_app_id);
       ASSERT_EQ(1U, tab->navigations.size());
-      ASSERT_EQ(12, tab->navigations[0].index());
       ASSERT_EQ(tab->navigations[0].virtual_url(), GURL("http://foo/1"));
       ASSERT_EQ(tab->navigations[0].referrer().url, GURL("referrer"));
       ASSERT_EQ(tab->navigations[0].title(), string16(ASCIIToUTF16("title")));
       ASSERT_EQ(tab->navigations[0].transition(),
                 content::PAGE_TRANSITION_TYPED);
     }
   }
 }
 
 }  // namespace
@@ skipping 971 matching lines @@
   error = model_associator_->AssociateModels();
   ASSERT_FALSE(error.IsSet());
 
   // Add some more tabs to ensure we don't conflict with the pre-existing tab
   // node.
   AddTab(browser(), GURL("http://baz1"));
   AddTab(browser(), GURL("http://baz2"));
 }
 
 }  // namespace browser_sync