Adds a field trial flag to control whether to use an alternate Instant search base page URL for pre…

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 b50d75cf1087ef052a47c7a88c5e0c707849d23e..f93fb074ec3f30cc26375a3e5eacaca55803faf3 100644
--- a/chrome/browser/search/search_unittest.cc
+++ b/chrome/browser/search/search_unittest.cc
@@ -589,6 +589,13 @@ TEST_F(SearchTest, GetInstantURL) {
   // Disable suggest. No Instant URL.
   profile()->GetPrefs()->SetBoolean(prefs::kSearchSuggestEnabled, false);
   EXPECT_EQ(GURL(), GetInstantURL(profile(), kDisableStartMargin, false));
+
+  // Use alternate Instant search base URL.
+  profile()->GetPrefs()->SetBoolean(prefs::kSearchSuggestEnabled, true);
+  ASSERT_TRUE(base::FieldTrialList::CreateFieldTrial(
+      "EmbeddedSearch", "Group1 espv:8 use_alternate_instant_url:1"));
+  EXPECT_EQ(GURL("https://foo.com/search?foo=foo&qbp=1#foo=foo&strk"),
+            GetInstantURL(profile(), kDisableStartMargin, false));
 }
 
 TEST_F(SearchTest, StartMarginCGI) {
@@ -689,6 +696,18 @@ TEST_F(SearchTest, ShouldPrefetchSearchResults_EnabledViaFieldTrial) {
   EXPECT_EQ(80ul, EmbeddedSearchPageVersion());
 }
 
+TEST_F(SearchTest, ShouldUseAltInstantURL_DisabledViaFieldTrial) {
+  ASSERT_TRUE(base::FieldTrialList::CreateFieldTrial(
+      "EmbeddedSearch", "Group1 espv:8 use_alternate_instant_url:0"));
+  EXPECT_FALSE(ShouldUseAltInstantURL());
+}
+
+TEST_F(SearchTest, ShouldUseAltInstantURL_EnabledViaFieldTrial) {
+  ASSERT_TRUE(base::FieldTrialList::CreateFieldTrial(
+      "EmbeddedSearch", "Group1 espv:8 use_alternate_instant_url:1"));
+  EXPECT_TRUE(ShouldUseAltInstantURL());
+}
+
 TEST_F(SearchTest,
        ShouldPrerenderInstantUrlOnOmniboxFocus_PrefetchResultsFlagDisabled) {
   ASSERT_TRUE(base::FieldTrialList::CreateFieldTrial(