Reload Local NTP on default search provider change.

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 79 matching lines @@
 // if the engine doesn't have an Instant URL, or if it shouldn't be used (say
 // because it doesn't satisfy the requirements for extended mode or if Instant
 // is disabled through preferences). Callers must check that the returned URL is
 // valid before using it. The value of |start_margin| is used for the "es_sm"
 // parameter in the URL.
 // NOTE: This method expands the default search engine's instant_url template,
 // so it shouldn't be called from SearchTermsData or other such code that would
 // lead to an infinite recursion.
 GURL GetInstantURL(Profile* profile, int start_margin);
 
-// Returns the Local Instant URL of the default search engine.  In particular,
-// a Google search provider will include a special query parameter, indicating
-// to the JS that Google-specific New Tab Page elements should be rendered.
+// Returns the Local Instant URL of the New Tab Page.
+// TODO(kmadhusu): Remove this function and update the call sites.
 GURL GetLocalInstantURL(Profile* profile);
 
+// Returns true if the default search provider is Google. Used to indicate the
+// JS that Google-specific New Tab Page elements should be rendered.
+bool DefaultSearchProviderIsGoogle(Profile* profile);
+
 // Returns true if 'use_remote_ntp_on_startup' flag is enabled in field trials
 // to always show the remote NTP on browser startup.
 bool ShouldPreferRemoteNTPOnStartup();
 
 // Returns true if the Instant NTP should be preloaded before it is shown.
 bool ShouldPreloadInstantNTP(Profile* profile);
 
 // Returns true if the Instant NTP should be shown and false if not.
 bool ShouldShowInstantNTP();
 
@@ skipping 73 matching lines @@
                                     bool default_value,
                                     const FieldTrialFlags& flags);
 
 // Let tests reset the gate that prevents metrics from being sent more than
 // once.
 void ResetInstantExtendedOptInStateGateForTest();
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_SEARCH_SEARCH_H_