MD Settings: Add helper method for responding to cr.sendWithPromise.

chrome/browser/ui/webui/settings/md_settings_ui.cc

 // Copyright 2015 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/settings/md_settings_ui.h"
 
 #include <stddef.h>
 
 #include <string>
 
@@ skipping 22 matching lines @@
 #endif  // defined(OS_CHROMEOS)
 
 namespace settings {
 
 SettingsPageUIHandler::SettingsPageUIHandler() {
 }
 
 SettingsPageUIHandler::~SettingsPageUIHandler() {
 }
 
+void SettingsPageUIHandler::CallJavascriptCallback(
+    content::WebUI* webui, const base::Value& callbackId,
+    const base::Value& response) {
+  // cr.webUIResponse is a global JS function exposed from cr.js.
+  webui->CallJavascriptFunction("cr.webUIResponse", callbackId, response);

[Dan Beam, 2016/01/27 00:23:57]

why not just web_ui()?

[dpapad, 2016/01/27 00:45:23]

Ah, fixed.

+}
+
 MdSettingsUI::MdSettingsUI(content::WebUI* web_ui)
     : content::WebUIController(web_ui) {
   Profile* profile = Profile::FromWebUI(web_ui);
   AddSettingsPageUIHandler(new AppearanceHandler(web_ui));
   AddSettingsPageUIHandler(new ClearBrowsingDataHandler(web_ui));
   AddSettingsPageUIHandler(new DefaultBrowserHandler(web_ui));
   AddSettingsPageUIHandler(new DownloadsHandler());
   AddSettingsPageUIHandler(new FontHandler(web_ui));
   AddSettingsPageUIHandler(new LanguagesHandler(web_ui));
   AddSettingsPageUIHandler(new PeopleHandler(profile));
@@ skipping 28 matching lines @@
 
 void MdSettingsUI::AddSettingsPageUIHandler(
     content::WebUIMessageHandler* handler_raw) {
   scoped_ptr<content::WebUIMessageHandler> handler(handler_raw);
   DCHECK(handler.get());
 
   web_ui()->AddMessageHandler(handler.release());
 }
 
 }  // namespace settings