Add Shortcuts database histogram.

chrome/browser/history/shortcuts_database.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/history/shortcuts_database.h"
 
 #include <map>
 #include <string>
 #include <vector>
 
@@ skipping 39 matching lines @@
 
 }  // namespace
 
 namespace history {
 
 ShortcutsDatabase::ShortcutsDatabase(Profile* profile) {
   database_path_ = profile->GetPath().Append(chrome::kShortcutsDatabaseName);
 }
 
 bool ShortcutsDatabase::Init() {
+  db_.set_histogram_tag("Shortcuts");
+
   // Set the database page size to something a little larger to give us
   // better performance (we're typically seek rather than bandwidth limited).
   // This only has an effect before any tables have been created, otherwise
   // this is a NOP. Must be a power of 2 and a max of 8192.
   db_.set_page_size(4096);
 
   // Run the database in exclusive mode. Nobody else should be accessing the
   // database while we're running, and this will give somewhat improved perf.
   db_.set_exclusive_locking();
 
@@ skipping 100 matching lines @@
                      "last_access_time INTEGER, "
                      "number_of_hits INTEGER)", kShortcutsTableName).c_str())) {
       NOTREACHED();
       return false;
     }
   }
   return true;
 }
 
 }  // namespace history