Add PrerenderLocalPredictor, which will eventually perform

chrome/browser/history/history_backend_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 <set>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
@@ skipping 46 matching lines @@
   explicit HistoryBackendTestDelegate(HistoryBackendTest* test) : test_(test) {}
 
   virtual void NotifyProfileError(int backend_id,
                                   sql::InitStatus init_status) OVERRIDE {}
   virtual void SetInMemoryBackend(int backend_id,
                                   InMemoryHistoryBackend* backend) OVERRIDE;
   virtual void BroadcastNotifications(int type,
                                       HistoryDetails* details) OVERRIDE;
   virtual void DBLoaded(int backend_id) OVERRIDE;
   virtual void StartTopSitesMigration(int backend_id) OVERRIDE;
+  virtual void NotifyVisitDBObserversOnAddVisit(
+      const BriefVisitInfo& info) OVERRIDE {}
 
  private:
   // Not owned by us.
   HistoryBackendTest* test_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryBackendTestDelegate);
 };
 
 class HistoryBackendCancelableRequest : public CancelableRequestProvider,
                                        public CancelableRequestConsumerBase {
@@ skipping 1417 matching lines @@
   EXPECT_EQ(cur_version, file_version);
 
   // Check visit_duration column in visits table is created and set to 0.
   s1.Assign(archived_db.GetUniqueStatement(
       "SELECT visit_duration FROM visits LIMIT 1"));
   ASSERT_TRUE(s1.Step());
   EXPECT_EQ(0, s1.ColumnInt(0));
 }
 
 }  // namespace history