Omnibox: Add Field Trial to Make Shortcuts More Aggressive

chrome/browser/omnibox/omnibox_field_trial.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/omnibox/omnibox_field_trial.h"
 
 #include <string>
 
 #include "base/metrics/field_trial.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/common/metrics/metrics_util.h"
 #include "chrome/common/metrics/variations/variation_ids.h"
 #include "chrome/common/metrics/variations/variations_util.h"
 
 namespace {
 
 // Field trial names.
 const char kDisallowInlineHQPFieldTrialName[] = "OmniboxDisallowInlineHQP";
 const char kHUPCullRedirectsFieldTrialName[] = "OmniboxHUPCullRedirects";
 const char kHUPCreateShorterMatchFieldTrialName[] =
     "OmniboxHUPCreateShorterMatch";
 const char kStopTimerFieldTrialName[] = "OmniboxStopTimer";
+const char kShortcutsScoringFieldTrialName[] = "OmniboxShortcutsScoring";
 
 // The autocomplete dynamic field trial name prefix.  Each field trial is
 // configured dynamically and is retrieved automatically by Chrome during
 // the startup.
 const char kAutocompleteDynamicFieldTrialPrefix[] = "AutocompleteDynamicTrial_";
 // The maximum number of the autocomplete dynamic field trials (aka layers).
 const int kMaxAutocompleteDynamicFieldTrials = 5;
 
 // Field trial experiment probabilities.
 
@@ skipping 198 matching lines @@
   // Look for group names starting with "EnableZeroSuggest"
   for (int i = 0; i < kMaxAutocompleteDynamicFieldTrials; ++i) {
     const std::string& group_name = base::FieldTrialList::FindFullName(
         DynamicFieldTrialName(i));
     const char kEnableZeroSuggest[] = "EnableZeroSuggest";
     if (StartsWithASCII(group_name, kEnableZeroSuggest, true))
       return true;
   }
   return false;
 }
+
+// If the active group name starts with "MaxRelevance_", extract the
+// int that immediately following that, returning true on success.
+bool OmniboxFieldTrial::ShortcutsScoringMaxRelevance(int* max_relevance) {
+  std::string group_name =
+      base::FieldTrialList::FindFullName(kShortcutsScoringFieldTrialName);
+  const char kMaxRelevanceGroupPrefix[] = "MaxRelevance_";
+  if (!StartsWithASCII(group_name, kMaxRelevanceGroupPrefix, true))
+    return false;
+  if (!base::StringToInt(base::StringPiece(
+          group_name.substr(strlen(kMaxRelevanceGroupPrefix))),
+                         max_relevance)) {
+    LOG(WARNING) << "Malformed MaxRelevance string: " << group_name;
+    return false;
+  }
+  return true;
+}