Set up a field trial flag to prerender Instant search base url on omnibox focus event.

chrome/browser/search/search_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 "base/command_line.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram_base.h"
 #include "base/metrics/histogram_samples.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/prefs/pref_service.h"
@@ skipping 671 matching lines @@
 }
 
 TEST_F(SearchTest, ShouldPrefetchSearchResults_EnabledViaFieldTrial) {
   ASSERT_TRUE(base::FieldTrialList::CreateFieldTrial(
       "EmbeddedSearch",
       "Group1 espv:80 prefetch_results:1"));
   EXPECT_TRUE(ShouldPrefetchSearchResults());
   EXPECT_EQ(80ul, EmbeddedSearchPageVersion());
 }
 
+TEST_F(SearchTest,
+       ShouldPrerenderInstantUrlOnOmniboxFocus_DisabledViaFieldTrial) {
+  ASSERT_TRUE(base::FieldTrialList::CreateFieldTrial(
+      "EmbeddedSearch",
+      "Group1 espv:89 prerender_instant_url_on_omnibox_focus:0"));
+  EXPECT_FALSE(ShouldPrerenderInstantUrlOnOmniboxFocus());
+  EXPECT_EQ(89ul, EmbeddedSearchPageVersion());
+}
+
+TEST_F(SearchTest,
+       ShouldPrerenderInstantUrlOnOmniboxFocus_EnabledViaFieldTrial) {
+  ASSERT_TRUE(base::FieldTrialList::CreateFieldTrial(
+      "EmbeddedSearch",
+      "Group1 espv:80 prerender_instant_url_on_omnibox_focus:1"));
+  EXPECT_TRUE(ShouldPrerenderInstantUrlOnOmniboxFocus());
+  EXPECT_EQ(80ul, EmbeddedSearchPageVersion());
+}
+
 TEST_F(SearchTest, ShouldPrefetchSearchResults_EnabledViaCommandLine) {
   CommandLine::ForCurrentProcess()->AppendSwitch(
       switches::kPrefetchSearchResults);
   // Command-line enable should override Finch.
   ASSERT_TRUE(base::FieldTrialList::CreateFieldTrial(
       "EmbeddedSearch",
       "Group1 espv:80 prefetch_results:0"));
   EXPECT_TRUE(ShouldPrefetchSearchResults());
   EXPECT_EQ(80ul, EmbeddedSearchPageVersion());
 }
@@ skipping 435 matching lines @@
 }
 
 TEST_F(OriginChipTest, CommandLineOnSrp) {
   CommandLine::ForCurrentProcess()->AppendSwitch(
       switches::kEnableOriginChipOnSrp);
   EXPECT_TRUE(ShouldDisplayOriginChip());
   EXPECT_EQ(ORIGIN_CHIP_ON_SRP, GetOriginChipCondition());
 }
 
 }  // namespace chrome