Adding more histograms to ResourcePrefetchPredictor.

chrome/browser/predictors/resource_prefetch_predictor_tables.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 "chrome/browser/predictors/resource_prefetch_predictor_tables.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/stringprintf.h"
+#include "chrome/browser/predictors/resource_prefetch_predictor.h"
 #include "content/public/browser/browser_thread.h"
 #include "sql/statement.h"
 
 using content::BrowserThread;
 
 namespace {
 
 const char kResourcePredictorUrlTableName[] = "resource_prefetch_predictor_url";
 
 // The maximum length allowed for strings in the database.
@@ skipping 217 matching lines @@
       "consecutive_misses INTEGER, "
       "average_position DOUBLE, "
       "PRIMARY KEY(main_page_url, resource_url))",
       kResourcePredictorUrlTableName);
 
   if (!DB()->DoesTableExist(kResourcePredictorUrlTableName) &&
       !DB()->Execute(url_table_creation_statement.c_str()))
     ResetDB();
 }
 
-void ResourcePrefetchPredictorTables::LogDatabaseStats()  {
+void ResourcePrefetchPredictorTables::LogDatabaseStats(Profile* profile)  {
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::DB));
+
+  if (!ResourcePrefetchPredictor::IsEnabled(profile))
+    return;
+
   if (CantAccessDatabase())
     return;
 
-  sql::Statement url_statement(DB()->GetUniqueStatement(
+  sql::Statement total_rows_statement(DB()->GetUniqueStatement(
       base::StringPrintf("SELECT count(*) FROM %s",
                          kResourcePredictorUrlTableName).c_str()));
-  if (url_statement.Step())
+  if (total_rows_statement.Step())
     UMA_HISTOGRAM_COUNTS("ResourcePrefetchPredictor.UrlTableRowCount",
-                         url_statement.ColumnInt(0));
+                         total_rows_statement.ColumnInt(0));
 }
 
 }  // namespace predictors