Move ShouldHideTopVerbatimMatch to components/search

To remove chrome/ dependency from AutocompleteResult

BUG=388504
TEST=components_unittest --gtest_filter="ShouldHideTopVerbatimTest.*"

Review URL: https://codereview.chromium.org/450663002

Cr-Commit-Position: refs/heads/master@{#288958}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288958 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 45 insertions, 0 deletions

diff --git a/components/search/search.cc b/components/search/search.cc
index 8689e51..d7e7276 100644
--- a/components/search/search.cc
+++ b/components/search/search.cc
@@ -35,6 +35,8 @@ const uint64 kEmbeddedSearchEnabledVersion = 2;
 const uint64 kEmbeddedPageVersionDefault = 2;
 #endif
 
+const char kHideVerbatimFlagName[] = "hide_verbatim";
+
 // Constants for the field trial name and group prefix.
 // Note in M30 and below this field trial was named "InstantExtended" and in
 // M31 was renamed to EmbeddedSearch for clarity and cleanliness.  Since we
@@ -143,4 +145,10 @@ bool GetBoolValueForFlagWithDefault(const std::string& flag,
   return !!GetUInt64ValueForFlagWithDefault(flag, default_value ? 1 : 0, flags);
 }
 
+bool ShouldHideTopVerbatimMatch() {
+  FieldTrialFlags flags;
+  return GetFieldTrialInfo(&flags) && GetBoolValueForFlagWithDefault(
+      kHideVerbatimFlagName, false, flags);
+}
+
 }  // namespace chrome
diff --git a/components/search/search.h b/components/search/search.h
index df27e60..6cc7927 100644
--- a/components/search/search.h
+++ b/components/search/search.h
@@ -54,6 +54,11 @@ bool GetBoolValueForFlagWithDefault(const std::string& flag,
                                     bool default_value,
                                     const FieldTrialFlags& flags);
 
+// Returns true if 'hide_verbatim' flag is enabled in field trials
+// to hide the top match in the native suggestions dropdown if it is a verbatim
+// match.  See comments on ShouldHideTopMatch in autocomplete_result.h.
+bool ShouldHideTopVerbatimMatch();
+
 }  // namespace chrome
 
 #endif  // COMPONENTS_SEARCH_SEARCH_H_
diff --git a/components/search/search_unittest.cc b/components/search/search_unittest.cc
index b8c4e1d..f4382cc 100644
--- a/components/search/search_unittest.cc
+++ b/components/search/search_unittest.cc
@@ -130,4 +130,36 @@ TEST_F(EmbeddedSearchFieldTrialTest, GetFieldTrialInfoControlFlags) {
   EXPECT_EQ(3ul, flags.size());
 }
 
+typedef EmbeddedSearchFieldTrialTest ShouldHideTopVerbatimTest;
+
+TEST_F(ShouldHideTopVerbatimTest, DoNotHideByDefault) {
+  ASSERT_TRUE(base::FieldTrialList::CreateFieldTrial("EmbeddedSearch",
+                                                     "Control"));
+  EXPECT_FALSE(ShouldHideTopVerbatimMatch());
+}
+
+TEST_F(ShouldHideTopVerbatimTest, DoNotHideInInstantExtended) {
+  ASSERT_TRUE(base::FieldTrialList::CreateFieldTrial("EmbeddedSearch",
+                                                     "Group1"));
+  EXPECT_FALSE(ShouldHideTopVerbatimMatch());
+}
+
+TEST_F(ShouldHideTopVerbatimTest, EnableByFlagInInstantExtended) {
+  ASSERT_TRUE(base::FieldTrialList::CreateFieldTrial("EmbeddedSearch",
+                                                     "Group1 hide_verbatim:1"));
+  EXPECT_TRUE(ShouldHideTopVerbatimMatch());
+}
+
+TEST_F(ShouldHideTopVerbatimTest, EnableByFlagOutsideInstantExtended) {
+  ASSERT_TRUE(base::FieldTrialList::CreateFieldTrial(
+      "EmbeddedSearch", "Controll1 hide_verbatim:1"));
+  EXPECT_TRUE(ShouldHideTopVerbatimMatch());
+}
+
+TEST_F(ShouldHideTopVerbatimTest, DisableByFlag) {
+  ASSERT_TRUE(base::FieldTrialList::CreateFieldTrial("EmbeddedSearch",
+                                                     "Group1 hide_verbatim:0"));
+  EXPECT_FALSE(ShouldHideTopVerbatimMatch());
+}
+
 }  // namespace chrome