Move InMemoryURLIndex Caching Operations to FILE Thread

chrome/browser/history/history_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.
 
 // History unit tests come in two flavors:
 //
 // 1. The more complicated style is that the unit test creates a full history
 //    service. This spawns a background thread for the history backend, and
 //    all communication is asynchronous. This is useful for testing more
 //    complicated things or end-to-end behavior.
@@ skipping 96 matching lines @@
         redirect_query_success_(false),
         query_url_success_(false),
         db_(NULL) {
   }
   ~HistoryTest() {
   }
 
   // Creates the HistoryBackend and HistoryDatabase on the current thread,
   // assigning the values to backend_ and db_.
   void CreateBackendAndDatabase() {
-    backend_ =
-        new HistoryBackend(history_dir_, 0, new BackendDelegate(this), NULL);
+    backend_ = new HistoryBackend(NULL, history_dir_, 0,
+                                  new BackendDelegate(this), NULL);
     backend_->Init(std::string(), false);
     db_ = backend_->db_.get();
     DCHECK(in_mem_backend_.get()) << "Mem backend should have been set by "
         "HistoryBackend::Init";
   }
 
   void OnSegmentUsageAvailable(CancelableRequestProvider::Handle handle,
                                std::vector<PageUsageData*>* data) {
     page_usage_data_->swap(*data);
     MessageLoop::current()->Quit();
@@ skipping 824 matching lines @@
   history_service_ = history;
   history->ScheduleDBTask(task.get(), &request_consumer);
   request_consumer.CancelAllRequests();
   CleanupHistoryService();
   // WARNING: history has now been deleted.
   history = NULL;
   ASSERT_FALSE(task->done_invoked);
 }
 
 }  // namespace history