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

Google to other.

This also resets the pref to off if they go away from Google.

BUG=437889

Review URL: https://codereview.chromium.org/780703004

Cr-Commit-Position: refs/heads/master@{#307041}

chrome/browser/resources/options/browser_options.js

@@ -1197,6 +1197,18 @@ cr.define('options', function() {
           opt_error);
     },
 
+    /**
+     * Controls the visibility of all the hotword sections.
+     * @param {boolean} visible Whether to show hotword sections.
+     * @private
+     */
+    setHotwordSectionVisible_: function(visible) {
+      $('hotword-search').hidden = !visible;
+      $('hotword-always-on-search').hidden = !visible;
+      $('hotword-no-dsp-search').hidden = !visible;
+      $('audio-history').hidden = !visible;
+    },
+
     /**
      * Shows or hides the hotword retrain link
      * @param {boolean} visible Whether to show the link.
@@ -2115,6 +2127,7 @@ cr.define('options', function() {
     'setNativeThemeButtonEnabled',
     'setNetworkPredictionValue',
     'setHighContrastCheckboxState',
+    'setHotwordSectionVisible',
     'setMetricsReportingCheckboxState',
     'setMetricsReportingSettingVisibility',
     'setProfilesInfo',

chrome/browser/search/hotword_service.cc

@@ -743,6 +743,19 @@ void HotwordService::SetAudioHistoryHandler(
   audio_history_handler_.reset(handler);
 }
 
+void HotwordService::DisableHotwordPreferences() {
+  if (IsSometimesOnEnabled()) {
+    if (profile_->GetPrefs()->HasPrefPath(prefs::kHotwordSearchEnabled))
+      profile_->GetPrefs()->SetBoolean(prefs::kHotwordSearchEnabled, false);
+  } else if (IsAlwaysOnEnabled()) {
+    if (profile_->GetPrefs()->HasPrefPath(
+            prefs::kHotwordAlwaysOnSearchEnabled)) {
+      profile_->GetPrefs()->SetBoolean(prefs::kHotwordAlwaysOnSearchEnabled,
+                                       false);
+    }
+  }
+}
+
 void HotwordService::OnHotwordSearchEnabledChanged(
     const std::string& pref_name) {
   DCHECK_EQ(pref_name, std::string(prefs::kHotwordSearchEnabled));

chrome/browser/search/hotword_service.h

@@ -148,6 +148,9 @@ class HotwordService : public extensions::ExtensionRegistryObserver,
   // Sets the audio history handler. Used for tests.
   void SetAudioHistoryHandler(HotwordAudioHistoryHandler* handler);
 
+  // Turn off the currently enabled version of hotwording if one exists.
+  void DisableHotwordPreferences();
+
  private:
   class HotwordUserSessionStateObserver;
 

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

@@ -1208,6 +1208,22 @@ void BrowserOptionsHandler::OnTemplateURLServiceChanged() {
           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();
 }