Don't demote top match for certain match types.

chrome/browser/omnibox/omnibox_field_trial_unittest.cc

 // Copyright (c) 2013 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 "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/field_trial.h"
@@ skipping 170 matching lines @@
   OmniboxFieldTrial::GetDemotionsByType(
       AutocompleteInput::HOME_PAGE, &demotions_by_type);
   ASSERT_EQ(1u, demotions_by_type.size());
   VerifyDemotion(demotions_by_type, AutocompleteMatchType::NAVSUGGEST, 1.0);
   OmniboxFieldTrial::GetDemotionsByType(
       AutocompleteInput::BLANK, &demotions_by_type);
   ASSERT_EQ(1u, demotions_by_type.size());
   VerifyDemotion(demotions_by_type, AutocompleteMatchType::HISTORY_URL, 0.25);
 }
 
+TEST_F(OmniboxFieldTrialTest, GetUndemotableTopTypes) {
+  {
+    std::map<std::string, std::string> params;
+    const std::string rule(OmniboxFieldTrial::kUndemotableTopTypeRule);
+    params[rule + ":1:*"] = "1,3";
+    params[rule + ":3:*"] = "5";
+    params[rule + ":*:*"] = "2";
+    ASSERT_TRUE(chrome_variations::AssociateVariationParams(
+        OmniboxFieldTrial::kBundledExperimentFieldTrialName, "A", params));
+  }
+  base::FieldTrialList::CreateFieldTrial(
+      OmniboxFieldTrial::kBundledExperimentFieldTrialName, "A");
+  OmniboxFieldTrial::UndemotableTopMatchTypes undemotable_types;
+  undemotable_types = OmniboxFieldTrial::GetUndemotableTopTypes(
+      AutocompleteInput::NEW_TAB_PAGE);
+  ASSERT_EQ(2u, undemotable_types.size());
+  ASSERT_EQ(1u, undemotable_types.count(AutocompleteMatchType::HISTORY_URL));
+  ASSERT_EQ(1u, undemotable_types.count(AutocompleteMatchType::HISTORY_BODY));
+  undemotable_types = OmniboxFieldTrial::GetUndemotableTopTypes(
+      AutocompleteInput::HOME_PAGE);
+  ASSERT_EQ(1u, undemotable_types.size());
+  ASSERT_EQ(1u, undemotable_types.count(AutocompleteMatchType::NAVSUGGEST));
+  undemotable_types = OmniboxFieldTrial::GetUndemotableTopTypes(
+      AutocompleteInput::BLANK);
+  ASSERT_EQ(1u, undemotable_types.size());
+  ASSERT_EQ(1u, undemotable_types.count(AutocompleteMatchType::HISTORY_TITLE));
+}
+
 TEST_F(OmniboxFieldTrialTest, GetValueForRuleInContext) {
   // This test starts with Instant Extended off (the default state), then
   // enables Instant Extended and tests again on the same rules.
 
   {
     std::map<std::string, std::string> params;
     // Rule 1 has some exact matches and fallbacks at every level.
     params["rule1:1:0"] = "rule1-1-0-value";  // NEW_TAB_PAGE
     params["rule1:3:0"] = "rule1-3-0-value";  // HOME_PAGE
     params["rule1:4:1"] = "rule1-4-1-value";  // OTHER
@@ skipping 91 matching lines @@
   ExpectRuleValue("",
                   "rule4", AutocompleteInput::BLANK);      // no global fallback
   ExpectRuleValue("",
                   "rule4", AutocompleteInput::HOME_PAGE);  // no global fallback
 
   // Tests for rule 5 (a missing rule).
   ExpectRuleValue("",
                   "rule5", AutocompleteInput::OTHER);      // no rule at all
 #endif  // !defined(OS_IOS) && !defined(OS_ANDROID)
 }