Add a field trial for using lower sqlite cache sizes.

chrome/browser/autocomplete/history_url_provider.cc

 // Copyright (c) 2011 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/autocomplete/history_url_provider.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/autocomplete/autocomplete_match.h"
 #include "chrome/browser/history/history.h"
 #include "chrome/browser/history/history_backend.h"
 #include "chrome/browser/history/history_database.h"
+#include "chrome/browser/history/history_field_trial.h"
 #include "chrome/browser/history/history_types.h"
 #include "chrome/browser/net/url_fixer_upper.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "googleurl/src/gurl.h"
 #include "googleurl/src/url_parse.h"
 #include "googleurl/src/url_util.h"
 #include "net/base/net_util.h"
@@ skipping 315 matching lines @@
                                        HistoryURLProviderParams* params) {
   // We may get called with a NULL database if it couldn't be properly
   // initialized.
   if (!db) {
     params->failed = true;
   } else if (!params->cancel_flag.IsSet()) {
     base::TimeTicks beginning_time = base::TimeTicks::Now();
 
     DoAutocomplete(backend, db, params);
 
-    UMA_HISTOGRAM_TIMES("Autocomplete.HistoryAsyncQueryTime",
+    UMA_HISTOGRAM_TIMES("Autocomplete.HistoryAsyncQueryTime" +
+                            history::HistoryFieldTrial::GetGroupSuffix(),
                         base::TimeTicks::Now() - beginning_time);
   }
 
   // Return the results (if any) to the main thread.
   params->message_loop->PostTask(FROM_HERE, base::Bind(
       &HistoryURLProvider::QueryComplete, this, params));
 }
 
 // Used by both autocomplete passes, and therefore called on multiple different
 // threads (though not simultaneously).
@@ skipping 568 matching lines @@
         &match.contents_class);
   }
   match.description = info.title();
   AutocompleteMatch::ClassifyMatchInString(params->input.text(),
                                            info.title(),
                                            ACMatchClassification::NONE,
                                            &match.description_class);
 
   return match;
 }