[Hotword] Ok Google options disappear if search provider is changed from

chrome/browser/ui/webui/options/browser_options_handler.cc

 // Copyright (c) 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.
 
 #include "chrome/browser/ui/webui/options/browser_options_handler.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
@@ skipping 1187 matching lines @@
   }
 
   web_ui()->CallJavascriptFunction(
       "BrowserOptions.updateSearchEngines",
       search_engines,
       base::FundamentalValue(default_index),
       base::FundamentalValue(
           template_url_service_->is_default_search_managed() ||
           template_url_service_->IsExtensionControlledDefaultSearch()));
 
+  if (default_index != -1 && model_urls[default_index]->HasGoogleBaseURLs(
+          template_url_service_->search_terms_data())) {
+    // If the user has chosen Google as the default search provider, make
+    // hotwording as an option available again.
+    HandleRequestHotwordAvailable(nullptr);
+  } else {
+    // If the user has chosen a default search provide other than Google, turn
+    // off hotwording since other providers don't provide that functionality.
+    web_ui()->CallJavascriptFunction("BrowserOptions.setHotwordSectionVisible",
+                                     base::FundamentalValue(false));
+    HotwordService* hotword_service =
+        HotwordServiceFactory::GetForProfile(Profile::FromWebUI(web_ui()));
+    if (hotword_service)
+      hotword_service->DisableHotwordPreferences();
+  }
+
   SetupExtensionControlledIndicators();
 }
 
 void BrowserOptionsHandler::SetDefaultSearchEngine(
     const base::ListValue* args) {
   int selected_index = -1;
   if (!ExtractIntegerValue(args, &selected_index)) {
     NOTREACHED();
     return;
   }
@@ skipping 832 matching lines @@
 void BrowserOptionsHandler::OnPolicyUpdated(const policy::PolicyNamespace& ns,
                                             const policy::PolicyMap& previous,
                                             const policy::PolicyMap& current) {
   std::set<std::string> different_keys;
   current.GetDifferingKeys(previous, &different_keys);
   if (ContainsKey(different_keys, policy::key::kMetricsReportingEnabled))
     SetupMetricsReportingCheckbox();
 }
 
 }  // namespace options