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

chrome/browser/search/search_unittest.cc

Index: chrome/browser/search/search_unittest.cc
diff --git a/chrome/browser/search/search_unittest.cc b/chrome/browser/search/search_unittest.cc
index 6e6b6dccd83494e4b0f1109e3797a2b72332f1ca..9ded2fdfd0d268b668ea78bd69dd0600f566a708 100644
--- a/chrome/browser/search/search_unittest.cc
+++ b/chrome/browser/search/search_unittest.cc
@@ -689,6 +689,36 @@ TEST_F(SearchTest, ShouldPrefetchSearchResults_EnabledViaFieldTrial) {
   EXPECT_EQ(80ul, EmbeddedSearchPageVersion());
 }
 
+TEST_F(SearchTest,
+       ShouldPrerenderInstantUrlOnOmniboxFocus_PrefetchResultsFlagDisabled) {
+  ASSERT_TRUE(base::FieldTrialList::CreateFieldTrial(
+      "EmbeddedSearch",
+      "Group1 espv:80 prefetch_results:0 "
+      "prerender_instant_url_on_omnibox_focus:1"));
+  EXPECT_FALSE(ShouldPrerenderInstantUrlOnOmniboxFocus());
+  EXPECT_EQ(80ul, EmbeddedSearchPageVersion());
+}
+
+TEST_F(SearchTest,
+       ShouldPrerenderInstantUrlOnOmniboxFocus_DisabledViaFieldTrial) {
+  ASSERT_TRUE(base::FieldTrialList::CreateFieldTrial(
+      "EmbeddedSearch",
+      "Group1 espv:89 prefetch_results:1 "
+      "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 prefetch_results:1 "
+      "prerender_instant_url_on_omnibox_focus:1"));
+  EXPECT_TRUE(ShouldPrerenderInstantUrlOnOmniboxFocus());
+  EXPECT_EQ(80ul, EmbeddedSearchPageVersion());
+}
+
 TEST_F(SearchTest, ShouldPrefetchSearchResults_EnabledViaCommandLine) {
   CommandLine::ForCurrentProcess()->AppendSwitch(
       switches::kPrefetchSearchResults);
@@ -748,7 +778,7 @@ TEST_F(SearchTest, ShouldReuseInstantSearchBasePage_EnabledViaCommandLine) {
   // Command-line enable should override Finch.
   ASSERT_TRUE(base::FieldTrialList::CreateFieldTrial(
       "EmbeddedSearch",
-      "Group1 espv:89 prefetch_results:0 reuse_instant_search_base_page:0"));
+      "Group1 espv:89 prefetch_results:0 reuse_instant_search_base_page:1"));
   EXPECT_TRUE(ShouldPrefetchSearchResults());
   EXPECT_TRUE(ShouldReuseInstantSearchBasePage());
   EXPECT_EQ(89ul, EmbeddedSearchPageVersion());