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

chrome/browser/search/search.h

 // Copyright 2012 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.
 
 #ifndef CHROME_BROWSER_SEARCH_SEARCH_H_
 #define CHROME_BROWSER_SEARCH_SEARCH_H_
 
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 271 matching lines @@
 
 // Given a FieldTrialFlags object, returns the bool value of the provided flag.
 // Exposed for testing only.
 bool GetBoolValueForFlagWithDefault(const std::string& flag,
                                     bool default_value,
                                     const FieldTrialFlags& flags);
 
 // Returns the Cacheable New Tab Page URL for the given |profile|.
 GURL GetNewTabPageURL(Profile* profile);
 
+// Returns true if 'use_alternate_instant_url' flag is set to true in field
+// trials to use an alternate Instant search base page URL for prefetching
+// search results. This allows experimentation of Instant search.
+bool ShouldUseAltInstantURL();
+
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_SEARCH_SEARCH_H_