Use an experiment value to set the instant_extended.enabled pref default.

chrome/browser/ui/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 "chrome/browser/ui/search/search.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace chrome {
 namespace search {
 
 TEST(EmbeddedSearchFieldTrialTest, GetFieldTrialInfo) {
   FieldTrialFlags flags;
   uint64 group_number = 0;
   const uint64 ZERO = 0;
 
-  GetFieldTrialInfo("", &flags, &group_number);
+  EXPECT_FALSE(GetFieldTrialInfo("", &flags, &group_number));
   EXPECT_EQ(ZERO, group_number);
   EXPECT_EQ(ZERO, flags.size());
 
-  GetFieldTrialInfo("Group77", &flags, &group_number);
+  EXPECT_TRUE(GetFieldTrialInfo("Group77", &flags, &group_number));
   EXPECT_EQ(uint64(77), group_number);
   EXPECT_EQ(ZERO, flags.size());
 
   group_number = 0;
-  GetFieldTrialInfo("Group77.2", &flags, &group_number);
+  EXPECT_FALSE(GetFieldTrialInfo("Group77.2", &flags, &group_number));
   EXPECT_EQ(ZERO, group_number);
   EXPECT_EQ(ZERO, flags.size());
 
-  GetFieldTrialInfo("Invalid77", &flags, &group_number);
+  EXPECT_FALSE(GetFieldTrialInfo("Invalid77", &flags, &group_number));
   EXPECT_EQ(ZERO, group_number);
   EXPECT_EQ(ZERO, flags.size());
 
-  GetFieldTrialInfo("Group77 ", &flags, &group_number);
+  EXPECT_FALSE(GetFieldTrialInfo("Invalid77", &flags, NULL));
+  EXPECT_EQ(ZERO, flags.size());
+
+  EXPECT_TRUE(GetFieldTrialInfo("Group77 ", &flags, &group_number));
   EXPECT_EQ(uint64(77), group_number);
   EXPECT_EQ(ZERO, flags.size());
 
   group_number = 0;
   flags.clear();
   EXPECT_EQ(uint64(9999), GetUInt64ValueForFlagWithDefault("foo", 9999, flags));
-  GetFieldTrialInfo("Group77 foo:6", &flags, &group_number);
+  EXPECT_TRUE(GetFieldTrialInfo("Group77 foo:6", &flags, &group_number));
   EXPECT_EQ(uint64(77), group_number);
   EXPECT_EQ(uint64(1), flags.size());
   EXPECT_EQ(uint64(6), GetUInt64ValueForFlagWithDefault("foo", 9999, flags));
 
   group_number = 0;
   flags.clear();
-  GetFieldTrialInfo(
-      "Group77 bar:1 baz:7 cat:dogs", &flags, &group_number);
+  EXPECT_TRUE(GetFieldTrialInfo(
+      "Group77 bar:1 baz:7 cat:dogs", &flags, &group_number));
   EXPECT_EQ(uint64(77), group_number);
   EXPECT_EQ(uint64(3), flags.size());
   EXPECT_EQ(true, GetBoolValueForFlagWithDefault("bar", false, flags));
   EXPECT_EQ(uint64(7), GetUInt64ValueForFlagWithDefault("baz", 0, flags));
   EXPECT_EQ("dogs", GetStringValueForFlagWithDefault("cat", "", flags));
   EXPECT_EQ("default", GetStringValueForFlagWithDefault(
       "moose", "default", flags));
 
   group_number = 0;
   flags.clear();
-  GetFieldTrialInfo(
-      "Group77 bar:1 baz:7 cat:dogs DISABLED", &flags, &group_number);
+  EXPECT_FALSE(GetFieldTrialInfo(
+      "Group77 bar:1 baz:7 cat:dogs DISABLED", &flags, &group_number));
   EXPECT_EQ(ZERO, group_number);
   EXPECT_EQ(ZERO, flags.size());
 }
 
 }  // namespace search
 }  // namespace chrome