Fetch and actually set prefs (using chrome.send for now).

chrome/browser/ui/webui/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/md_settings_ui.h"
 
 #include <string>
 
 #include "base/values.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/webui/options/core_options_handler.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_ui.h"
 #include "content/public/browser/web_ui_data_source.h"
 #include "grit/browser_resources.h"
 #include "grit/settings_resources.h"
 #include "grit/settings_resources_map.h"
 
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/ui/webui/options/chromeos/core_chromeos_options_handler.h"
+#endif
+
 MdSettingsUI::MdSettingsUI(content::WebUI* web_ui)
     : content::WebUIController(web_ui) {
+  // TODO(jlklein): Remove handler logic once settingsPrivate is ready.
+  #if defined(OS_CHROMEOS)
+    core_handler_ = new chromeos::options::CoreChromeOSOptionsHandler();
+  #else
+    core_handler_ = new options::CoreOptionsHandler();
+  #endif
+
+  core_handler_->set_handlers_host(this);
+  scoped_ptr<options::OptionsPageUIHandler> handler(core_handler_);
+  DCHECK(handler.get());
+  if (handler->IsEnabled()) {
+    web_ui->AddMessageHandler(handler.release());
+  }
+
+
   content::WebUIDataSource* html_source =
       content::WebUIDataSource::Create(chrome::kChromeUIMdSettingsHost);
 
   // Add all settings resources.
   for (size_t i = 0; i < kSettingsResourcesSize; ++i) {
     html_source->AddResourcePath(kSettingsResources[i].name,
                                  kSettingsResources[i].value);
   }
 
   html_source->AddResourcePath("md_settings.css", IDR_MD_SETTINGS_UI_CSS);
   html_source->SetDefaultResource(IDR_MD_SETTINGS_UI_HTML);
 
   content::WebUIDataSource::Add(web_ui->GetWebContents()->GetBrowserContext(),
                                 html_source);
 }
 
 MdSettingsUI::~MdSettingsUI() {
 }
+
+void MdSettingsUI::InitializeHandlers() {
+  Profile* profile = Profile::FromWebUI(web_ui());
+  DCHECK(!profile->IsOffTheRecord() || profile->IsGuestSession());
+
+  core_handler_->InitializeHandler();
+  core_handler_->InitializePage();
+}
+
+void MdSettingsUI::OnFinishedLoading() {}