predictors: Add trace events to the resource_prefetch_predictor.

chrome/browser/predictors/resource_prefetch_predictor_tables.cc

 // Copyright 2014 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 "chrome/browser/predictors/resource_prefetch_predictor_tables.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <memory>
 #include <utility>
 
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/stringprintf.h"
+#include "base/trace_event/trace_event.h"
 #include "content/public/browser/browser_thread.h"
 #include "sql/meta_table.h"
 #include "sql/statement.h"
 #include "sql/transaction.h"
 
 using content::BrowserThread;
 using sql::Statement;
 
 namespace {
 
@@ skipping 87 matching lines @@
                      });
   data->mutable_redirect_endpoints()->erase(
       new_end, data->mutable_redirect_endpoints()->end());
 }
 
 void ResourcePrefetchPredictorTables::GetAllData(
     PrefetchDataMap* url_data_map,
     PrefetchDataMap* host_data_map,
     RedirectDataMap* url_redirect_data_map,
     RedirectDataMap* host_redirect_data_map) {
+  TRACE_EVENT0("browser", "ResourcePrefetchPredictor::GetAllData");
   DCHECK_CURRENTLY_ON(BrowserThread::DB);
   if (CantAccessDatabase())
     return;
 
   DCHECK(url_data_map);
   DCHECK(host_data_map);
   DCHECK(url_redirect_data_map);
   DCHECK(host_redirect_data_map);
   url_data_map->clear();
   host_data_map->clear();
   url_redirect_data_map->clear();
   host_redirect_data_map->clear();
 
   GetAllResourceDataHelper(PREFETCH_KEY_TYPE_URL, url_data_map);
   GetAllResourceDataHelper(PREFETCH_KEY_TYPE_HOST, host_data_map);
   GetAllRedirectDataHelper(PREFETCH_KEY_TYPE_URL, url_redirect_data_map);
   GetAllRedirectDataHelper(PREFETCH_KEY_TYPE_HOST, host_redirect_data_map);
 }
 
 void ResourcePrefetchPredictorTables::UpdateData(
     const PrefetchData& url_data,
     const PrefetchData& host_data,
     const RedirectData& url_redirect_data,
     const RedirectData& host_redirect_data) {
+  TRACE_EVENT0("browser", "ResourcePrefetchPredictor::UpdateData");
   DCHECK_CURRENTLY_ON(BrowserThread::DB);
   if (CantAccessDatabase())
     return;
 
   DCHECK(url_data.has_primary_key() || host_data.has_primary_key() ||
          url_redirect_data.has_primary_key() ||
          host_redirect_data.has_primary_key());
 
   DB()->BeginTransaction();
 
@@ skipping 338 matching lines @@
       return is_host ? kHostResourceTableName : kUrlResourceTableName;
     case PrefetchDataType::REDIRECT:
       return is_host ? kHostRedirectTableName : kUrlRedirectTableName;
   }
 
   NOTREACHED();
   return nullptr;
 }
 
 }  // namespace predictors