Introduce a field trial for Instant.

chrome/browser/autocomplete/autocomplete.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/autocomplete.h"
 
 #include <algorithm>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/i18n/number_formatting.h"
 #include "base/metrics/histogram.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/autocomplete/autocomplete_controller_delegate.h"
 #include "chrome/browser/autocomplete/autocomplete_match.h"
 #include "chrome/browser/autocomplete/builtin_provider.h"
 #include "chrome/browser/autocomplete/extension_app_provider.h"
 #include "chrome/browser/autocomplete/history_contents_provider.h"
 #include "chrome/browser/autocomplete/history_quick_provider.h"
 #include "chrome/browser/autocomplete/history_url_provider.h"
 #include "chrome/browser/autocomplete/keyword_provider.h"
 #include "chrome/browser/autocomplete/search_provider.h"
 #include "chrome/browser/autocomplete/shortcuts_provider.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/external_protocol/external_protocol_handler.h"
+#include "chrome/browser/instant/instant_field_trial.h"
 #include "chrome/browser/net/url_fixer_upper.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_io_data.h"
 #include "chrome/browser/ui/webui/history_ui.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "content/common/notification_service.h"
@@ skipping 748 matching lines @@
 // any copied entries. We do this from the time the user stopped typing as some
 // providers (such as SearchProvider) wait for the user to stop typing before
 // they initiate a query.
 static const int kExpireTimeMS = 500;
 
 AutocompleteController::AutocompleteController(
     Profile* profile,
     AutocompleteControllerDelegate* delegate)
     : delegate_(delegate),
       done_(true),
-      in_start_(false) {
+      in_start_(false),
+      profile_(profile) {
   search_provider_ = new SearchProvider(this, profile);
   providers_.push_back(search_provider_);
   // TODO(mrossetti): Remove the following and permanently modify the
   // HistoryURLProvider to not search titles once HQP is turned on permanently.
   bool hqp_enabled = !CommandLine::ForCurrentProcess()->HasSwitch(
                          switches::kDisableHistoryQuickProvider);
   if (hqp_enabled)
     providers_.push_back(new HistoryQuickProvider(this, profile));
   if (CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kEnableShortcutsProvider))
@@ skipping 25 matching lines @@
 
   providers_.clear();  // Not really necessary.
 }
 
 void AutocompleteController::SetProfile(Profile* profile) {
   Stop(true);
   for (ACProviders::iterator i(providers_.begin()); i != providers_.end(); ++i)
     (*i)->SetProfile(profile);
   input_.Clear();  // Ensure we don't try to do a "minimal_changes" query on a
                    // different profile.
+  profile_ = profile;
 }
 
 void AutocompleteController::Start(
     const string16& text,
     const string16& desired_tld,
     bool prevent_inline_autocomplete,
     bool prefer_keyword,
     bool allow_exact_keyword_match,
     AutocompleteInput::MatchesRequested matches_requested) {
   const string16 old_input_text(input_.text());
@@ skipping 21 matching lines @@
   base::TimeTicks start_time = base::TimeTicks::Now();
   for (ACProviders::iterator i(providers_.begin()); i != providers_.end();
        ++i) {
     (*i)->Start(input_, minimal_changes);
     if (matches_requested != AutocompleteInput::ALL_MATCHES)
       DCHECK((*i)->done());
   }
   if (matches_requested == AutocompleteInput::ALL_MATCHES &&
       (text.length() < 6)) {
     base::TimeTicks end_time = base::TimeTicks::Now();
-    std::string name = "Omnibox.QueryTime." + base::IntToString(text.length());
+    std::string name = "Omnibox.QueryTime." +
+                       InstantFieldTrial::GetGroupName(profile_) +
+                       base::IntToString(text.length());
     base::Histogram* counter = base::Histogram::FactoryGet(
         name, 1, 1000, 50, base::Histogram::kUmaTargetedHistogramFlag);
     counter->Add(static_cast<int>((end_time - start_time).InMilliseconds()));
   }
   in_start_ = false;
   CheckIfDone();
   UpdateResult(true);
 
   if (!done_)
     StartExpireTimer();
@@ skipping 134 matching lines @@
     }
   }
   done_ = true;
 }
 
 void AutocompleteController::StartExpireTimer() {
   if (result_.HasCopiedMatches())
     expire_timer_.Start(base::TimeDelta::FromMilliseconds(kExpireTimeMS),
                         this, &AutocompleteController::ExpireCopiedEntries);
 }