Add a button to open TalkBack settings in chrome://settings.

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

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_OPTIONS_BROWSER_OPTIONS_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_BROWSER_OPTIONS_HANDLER_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 319 matching lines @@
 
   // Called when the user confirmed factory reset. Chrome will
   // initiate asynchronous file operation and then log out.
   void PerformFactoryResetRestart(const base::ListValue* args);
 
   // Update visibility of Android apps settings section.
   void UpdateAndroidSettingsAppState(bool visible);
 
   // Called to show Android apps settings.
   void ShowAndroidAppsSettings(const base::ListValue* args);
+
+  // Called to show TalkBack settings.
+  void ShowAccessibilityTalkBackSettings(const base::ListValue *args);
 #endif
 
   // Setup the visibility for the metrics reporting setting.
   void SetupMetricsReportingSettingVisibility();
 
   // Update value of predictive network actions UI element.
   void SetupNetworkPredictionControl();
 
   // Setup the font size selector control.
   void SetupFontSizeSelector();
@@ skipping 81 matching lines @@
 
   // Used to get WeakPtr to self for use on the UI thread.
   base::WeakPtrFactory<BrowserOptionsHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserOptionsHandler);
 };
 
 }  // namespace options
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_BROWSER_OPTIONS_HANDLER_H_